Our contributors were Dulcie Lee, Jennifer Scott, Kate Whannel, Megan Fisher, Arryn Moy and Alex Kleiderman.
Have a good evening, and remember there's always more to read on our politics page - here.
What happened today?
PA MediaCopyright: PA Media
It was a dramatic first day after the Easter break, with Boris Johnson addressing MPs for the first time since becoming the UK's first sitting prime minister to be sanctioned for breaking the law.
What happened?
Johnson repeated the apology he made on camera last week for attending a birthday gathering thrown for him
He denied deliberately misleading MPs and said he didn't knowingly break the rules
Labour leader Sir Keir Starmer said his apology was "mealy-mouthed" and accused him of giving absurd excuses
The Lib Dems, Labour, SNP and SDLP all called for Johnson to resign
Tory MP Mark Harper said Johnson's actions were indefensible and submitted a letter of no confidence in him to the 1922 committee
What next?
On Thursday, MPs will debate a motion on whether or not to refer the PM to the privileges committee
If it passes, the committee will consider whether Johnson knowingly misled MPs, and could recommend a sanction. MPs would then vote on whether to accept the committee's recommendations
Meanwhile, the police investigation into alleged gatherings continues
Want more?
Read our full round up of the day in our main story here
Will the PM face more fines? We've calculated the odds
Are there more fines to come?
Jennifer Scott
Political reporter, BBC News
PA MediaCopyright: PA Media
So far, more than 50 fines have been issued for breaking Covid laws in No 10 and Whitehall.
The BBC is aware of three events that have led to fines so far.
But the Met Police's investigation is into 12 events in total - meaning there are nine more gatherings that could result in sanctions.
The prime minister is known to have attended at least two of these, and reports suggest he could have been at up to three more.
So in theory, Mr Johnson could face more fines, depending on the outcome of the police investigation.
The PM has promised to get back to focusing on voter priorities - including the cost of living crisis and the war on Ukraine.
But will his determination overcome any future twists and turns in this saga, whether it be fines or further damning details?
Johnson's defence laughable, says Covid bereaved families group
Let's get a final bit of reaction to today's events from the Covid-19 Bereaved Families for Justice UK group.
They say the PM's apology sounded like "the words of someone who is sorry they’ve been caught, not someone who regrets the harm they’ve done".
In a statement on Twitter the group say his defence that he didn't knowingly break the rules was laughable.
"Backbench Tory MPs might want us to move on from Partygate, but first they’ll need to move Johnson on from his office," they say.
PM debases himself and his government - Plaid Cymru MP
Also earlier, Plaid Cymru's Westminster leader Liz Savile Roberts described the PM as "a millstone round his government's neck".
"The PM debases himself, debases his office and debases his government," she said.
'Please, please, please resign now' - SDLP MP
We're just going back over a bit more of what was said in the Commons earlier, and SDLP MP Colum Eastwood said the PM and chancellor were "partying in Downing Street" while his constituents were "watching through care home windows as their parents died".
"We know he has no respect for the public but show us he has some respect for himself and please, please, please resign now."
We must decide PM's future soon - Tory MP
More now from Conservative MP Mark Harper, who earlier told the Commons that Boris Johnson was no longer worthy of the "great office" he holds.
Explaining his decision to submit a letter of no confidence in the PM, the former chief whip tells the BBC many people made extraordinary sacrifices to obey lockdown laws.
Harper says all his Conservative colleagues are going to have make a decision soon about whether they want Johnson to continue.
"I'm not expecting lots to follow me today, but they're going to have to reflect in the coming days and weeks," he says.
"I think many of them will reach the same conclusion that I have."
PM will be in India during Thursday's debate
Just a little aside...
When MPs head to the Commons on Thursday to debate the actions of Boris Johnson, and whether they merit a referral to the Privileges Committee, the prime minister will be nowhere near the chamber.
Instead, he will be Ahmedabad, India, as he begins a visit to the country to bolster trade.
Johnson will then travel to
New Delhi on Friday to meet Indian Prime Minister Narendra Modi.
We do understand the PM will be in the House for Prime Minister's Questions on Wednesday before his trip though.
Johnson to address Conservative backbenchers in private later
Boris Johnson's time at the despatch box has now come to an end. Oppostion MPs have been coming with call after call for his resignation.
Johnson will address Tory backbenchers behind closed doors at 20:00 BST.
How can we protect standards, asks Green MP
UK ParliamentCopyright: UK Parliament
The Green Party's Caroline Lucas asked earlier what could be done to protect the ministerial code - the rulebook on behaviour issued by the PM - "when the person who is entrusted with guarding it breaks that code".
Johnson said he didn't agree with the "characterisation" and reiterated that he had explained and apologised.
We found out earlier that MPs will get to vote on Thursday on whether Johnson should be investigated for knowingly misleading Parliament in his past statements about No 10 parties.
Most Conservative contributors welcome apology
Iain Watson
Political correspondent
While one new letter of no confidence in Boris Johnson
has gone in today, most non-Ukraine contributions from the Conservative benches have welcomed
the PM’s repeated apologies - though the former minister Steve Baker, a
Christian, wanted more than that: repentance.
Significantly, while he has organised many succesful
rebellions against his own party leaders, he did not join fellow Covid Recovery
Group member Mark Harper in calling for the current leader to go.
What's happened so far?
As we type, Boris Johnson is still in the House of Commons answering questions from MPs in his first appearance since being fined for breaking lockdown laws.
Here is a quick re-cap of what we have heard so far:
The PM repeated his apology that he made on camera last week for attending a birthday party thrown for him in the Cabinet Room in June 2020 during the first lockdown
But he said the hurt and upset caused by the rule breaking made him more determined to lead on the British people's priorities, including on Ukraine and the cost of living crisis
Labour leader Sir Keir Starmer called his statement "a joke" and "mealy mouthed"
Starmer repeated his call for the PM to resign, and urged Tory backbenches to oust him if he won't
The SNP and Lib Dems also called for Johnson to go
Many Tory MPs backed Johnson, especially over his actions in helping Ukraine
But the Conservative former chief whip, Mark Harper, said the PM was "no longer worthy of the great office he holds" and tweeted a letter of no confidence
Tory MP: Publish Sue Gray report in full
A little earlier, Tory MP Julian Lewis asked if the prime minister had the power to make senior civil servant Sue Gray publish her full report into the parties in Downing Street during lockdown.
You may remember Boris Johnson ordered her to carry out an inquiry - but its full publication was paused by the police investigation.
Lewis said publishing it "would put an end to this matter" and stop the government being "diverted away" from helping Ukraine.
Johnson said the Metropolitan Police should conclude its investigation before such a report is published.
WATCH: 'What a joke!' - Starmer reacts to PM's apology
"The public have made up their minds. They know what he is," Labour leader Sir Keir Starmer says.
Watch his verdict on Johnson's apology below.
Tory MP: We've all suffered
Tory MP Michael Fabricant, who has defended the PM throughout the Partygate row, says he is desperately sad to hear about his own constituent referenced by the Labour leader in his speech.
He describes how his best friend's mother died in hospital without them by their side, and notes that the PM's mother also died during the pandemic.
"We've all suffered from these heart-wrenching tragedies," he adds, "and none of us should forget it."
But it seems his support is still firmly with Boris Johnson.
PM could not have made a more humble apology - Tory MP
Conservative Steve Baker says the prime minister "could not have made a more humble apology".
He says the PM also needs to show repentance and asks for an assurance that "nothing of this kind will ever happen again".
Boris Johnson repeats his apology.
PM's apology was genuine, says DUP MP
The DUP's Sammy Wilson says the PM's apology was genuine.
He adds it is important to focus on the future rather than the past.
He asks Boris Johnson what discussions the PM has had about the weaponry Ukrainians need to drive back the Russians.
Johnson says the UK is in continuous discussions with Ukraine.
PM denies misleading Commons over parties
Tory backbencher Peter Bone points to the announcement earlier that MPs will vote on Thursday on whether to refer the PM to the privileges committee.
He says there is only one issue in question for such an investigation - "Did the prime minister deliberately mislead the House [over the parties]?"
Bone asks Johnson the question directly.
The PM answers: "No."
Former chief whip's blow could be significant
Iain Watson
Political correspondent
The former chief whip Mark Harper delivers a blow to the
PM - says he is not fit for high office.
So far he has kept his powder dry but as a formidable organiser, this
intervention could yet be significant.
Many other Conservative critics have bitten their tongues
during the Ukraine conflict.
Tory MP submits no confidence letter in PM
More on former chief whip Mark Harper, who confirms on Twitter that he's submitted a letter of no confidence in the prime minister.
In the letter, he says Johnson is "no longer able to deliver the principled leadership required to take our country forward".
Tory MPs can trigger a leadership contest if 54 letters of no confidence are sent to Sir Graham Brady, who chairs a committee of backbench MPs known as the 1922 Committee.
There's no official running tally of how many letters have been submitted - they have been triggered by various issues over the course of Johnson's leadership - the only way we'll know for sure is if that crucial threshold of 54 letters is reached.
Live Reporting
Edited by Emma Owen
All times stated are UK
PA MediaCopyright: PA Media -
Johnson repeated the apology he made on camera last week for attending a birthday gathering thrown for him
-
He denied deliberately misleading MPs and said he didn't knowingly break the rules
-
Labour leader Sir Keir Starmer said his apology was "mealy-mouthed" and accused him of giving absurd excuses
-
The Lib Dems, Labour, SNP and SDLP all called for Johnson to resign
-
Tory MP Mark Harper said Johnson's actions were indefensible and submitted a letter of no confidence in him to the 1922 committee
-
On Thursday, MPs will debate a motion on whether or not to refer the PM to the privileges committee
-
If it passes, the committee will consider whether Johnson knowingly misled MPs, and could recommend a sanction. MPs would then vote on whether to accept the committee's recommendations
-
Meanwhile, the police investigation into alleged gatherings continues
-
Read our full round up of the day in our main story here
-
Will the PM face more fines? We've calculated the odds
PA MediaCopyright: PA Media UK ParliamentCopyright: UK Parliament -
The PM repeated his apology that he made on camera last week for attending a birthday party thrown for him in the Cabinet Room in June 2020 during the first lockdown
-
But he said the hurt and upset caused by the rule breaking made him more determined to lead on the British people's priorities, including on Ukraine and the cost of living crisis
-
Labour leader Sir Keir Starmer called his statement "a joke" and "mealy mouthed"
-
Starmer repeated his call for the PM to resign, and urged Tory backbenches to oust him if he won't
-
The SNP and Lib Dems also called for Johnson to go
-
Many Tory MPs backed Johnson, especially over his actions in helping Ukraine
-
But the Conservative former chief whip, Mark Harper, said the PM was "no longer worthy of the great office he holds" and tweeted a letter of no confidence
View more on twitterView more on twitter
Latest PostGoodnight
That's it from us on this subject for today.
Our contributors were Dulcie Lee, Jennifer Scott, Kate Whannel, Megan Fisher, Arryn Moy and Alex Kleiderman.
Have a good evening, and remember there's always more to read on our politics page - here.
What happened today?
It was a dramatic first day after the Easter break, with Boris Johnson addressing MPs for the first time since becoming the UK's first sitting prime minister to be sanctioned for breaking the law.
What happened?
What next?
Want more?
Are there more fines to come?
Jennifer Scott
Political reporter, BBC News
So far, more than 50 fines have been issued for breaking Covid laws in No 10 and Whitehall.
The BBC is aware of three events that have led to fines so far.
But the Met Police's investigation is into 12 events in total - meaning there are nine more gatherings that could result in sanctions.
The prime minister is known to have attended at least two of these, and reports suggest he could have been at up to three more.
So in theory, Mr Johnson could face more fines, depending on the outcome of the police investigation.
The PM has promised to get back to focusing on voter priorities - including the cost of living crisis and the war on Ukraine.
But will his determination overcome any future twists and turns in this saga, whether it be fines or further damning details?
Read more here.
Johnson's defence laughable, says Covid bereaved families group
Let's get a final bit of reaction to today's events from the Covid-19 Bereaved Families for Justice UK group.
They say the PM's apology sounded like "the words of someone who is sorry they’ve been caught, not someone who regrets the harm they’ve done".
In a statement on Twitter the group say his defence that he didn't knowingly break the rules was laughable.
"Backbench Tory MPs might want us to move on from Partygate, but first they’ll need to move Johnson on from his office," they say.
PM debases himself and his government - Plaid Cymru MP
Also earlier, Plaid Cymru's Westminster leader Liz Savile Roberts described the PM as "a millstone round his government's neck".
"The PM debases himself, debases his office and debases his government," she said.
'Please, please, please resign now' - SDLP MP
We're just going back over a bit more of what was said in the Commons earlier, and SDLP MP Colum Eastwood said the PM and chancellor were "partying in Downing Street" while his constituents were "watching through care home windows as their parents died".
"We know he has no respect for the public but show us he has some respect for himself and please, please, please resign now."
We must decide PM's future soon - Tory MP
More now from Conservative MP Mark Harper, who earlier told the Commons that Boris Johnson was no longer worthy of the "great office" he holds.
Explaining his decision to submit a letter of no confidence in the PM, the former chief whip tells the BBC many people made extraordinary sacrifices to obey lockdown laws.
Harper says all his Conservative colleagues are going to have make a decision soon about whether they want Johnson to continue.
"I'm not expecting lots to follow me today, but they're going to have to reflect in the coming days and weeks," he says.
"I think many of them will reach the same conclusion that I have."
PM will be in India during Thursday's debate
Just a little aside...
When MPs head to the Commons on Thursday to debate the actions of Boris Johnson, and whether they merit a referral to the Privileges Committee, the prime minister will be nowhere near the chamber.
Instead, he will be Ahmedabad, India, as he begins a visit to the country to bolster trade.
Johnson will then travel to New Delhi on Friday to meet Indian Prime Minister Narendra Modi.
We do understand the PM will be in the House for Prime Minister's Questions on Wednesday before his trip though.
Johnson to address Conservative backbenchers in private later
Boris Johnson's time at the despatch box has now come to an end. Oppostion MPs have been coming with call after call for his resignation.
Johnson will address Tory backbenchers behind closed doors at 20:00 BST.
How can we protect standards, asks Green MP
The Green Party's Caroline Lucas asked earlier what could be done to protect the ministerial code - the rulebook on behaviour issued by the PM - "when the person who is entrusted with guarding it breaks that code".
The Brighton Pavilion MP then quoted a historian who recently described Johnson as a "rogue prime minister".
Johnson said he didn't agree with the "characterisation" and reiterated that he had explained and apologised.
We found out earlier that MPs will get to vote on Thursday on whether Johnson should be investigated for knowingly misleading Parliament in his past statements about No 10 parties.
Most Conservative contributors welcome apology
Iain Watson
Political correspondent
While one new letter of no confidence in Boris Johnson has gone in today, most non-Ukraine contributions from the Conservative benches have welcomed the PM’s repeated apologies - though the former minister Steve Baker, a Christian, wanted more than that: repentance.
Significantly, while he has organised many succesful rebellions against his own party leaders, he did not join fellow Covid Recovery Group member Mark Harper in calling for the current leader to go.
What's happened so far?
As we type, Boris Johnson is still in the House of Commons answering questions from MPs in his first appearance since being fined for breaking lockdown laws.
Here is a quick re-cap of what we have heard so far:
Tory MP: Publish Sue Gray report in full
A little earlier, Tory MP Julian Lewis asked if the prime minister had the power to make senior civil servant Sue Gray publish her full report into the parties in Downing Street during lockdown.
You may remember Boris Johnson ordered her to carry out an inquiry - but its full publication was paused by the police investigation.
Lewis said publishing it "would put an end to this matter" and stop the government being "diverted away" from helping Ukraine.
Johnson said the Metropolitan Police should conclude its investigation before such a report is published.
WATCH: 'What a joke!' - Starmer reacts to PM's apology
"The public have made up their minds. They know what he is," Labour leader Sir Keir Starmer says.
Watch his verdict on Johnson's apology below.
Tory MP: We've all suffered
Tory MP Michael Fabricant, who has defended the PM throughout the Partygate row, says he is desperately sad to hear about his own constituent referenced by the Labour leader in his speech.
He describes how his best friend's mother died in hospital without them by their side, and notes that the PM's mother also died during the pandemic.
"We've all suffered from these heart-wrenching tragedies," he adds, "and none of us should forget it."
But it seems his support is still firmly with Boris Johnson.
PM could not have made a more humble apology - Tory MP
Conservative Steve Baker says the prime minister "could not have made a more humble apology".
He says the PM also needs to show repentance and asks for an assurance that "nothing of this kind will ever happen again".
Boris Johnson repeats his apology.
PM's apology was genuine, says DUP MP
The DUP's Sammy Wilson says the PM's apology was genuine.
He adds it is important to focus on the future rather than the past.
He asks Boris Johnson what discussions the PM has had about the weaponry Ukrainians need to drive back the Russians.
Johnson says the UK is in continuous discussions with Ukraine.
PM denies misleading Commons over parties
Tory backbencher Peter Bone points to the announcement earlier that MPs will vote on Thursday on whether to refer the PM to the privileges committee.
He says there is only one issue in question for such an investigation - "Did the prime minister deliberately mislead the House [over the parties]?"
Bone asks Johnson the question directly.
The PM answers: "No."
Former chief whip's blow could be significant
Iain Watson
Political correspondent
The former chief whip Mark Harper delivers a blow to the PM - says he is not fit for high office.
So far he has kept his powder dry but as a formidable organiser, this intervention could yet be significant.
Many other Conservative critics have bitten their tongues during the Ukraine conflict.
Tory MP submits no confidence letter in PM
More on former chief whip Mark Harper, who confirms on Twitter that he's submitted a letter of no confidence in the prime minister.
In the letter, he says Johnson is "no longer able to deliver the principled leadership required to take our country forward".
Tory MPs can trigger a leadership contest if 54 letters of no confidence are sent to Sir Graham Brady, who chairs a committee of backbench MPs known as the 1922 Committee.
There's no official running tally of how many letters have been submitted - they have been triggered by various issues over the course of Johnson's leadership - the only way we'll know for sure is if that crucial threshold of 54 letters is reached.