Theresa May triggers the official Brexit process in a letter to EU
Mrs May tells MPs it's a "historic moment... there is no turning back"
The EU's Donald Tusk says "missing you already"
Two years of exit negotiations to follow
PMQs
House of Commons
Parliament
Sticking to the subject of police funding, Jeremy Corbyn says that police morale is low and that the number of police officers has fallen.
He asks for a guarantee that police on the frontline will be protected.
Theresa May replies that crime has fallen to a record low since 2010.
There is little optimism in the European press on the start of Britain's departure from the EU.
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Image source, APA new trade deal between the UK and the rest of the EU can only be struck after Britain has left, a draft resolution of the European Parliament has suggested.
The document says any transitional agreement to tide over the period before a trade deal is put in place should last no more than three years after the expected date of Brexit in 2019.
The resolution, expected to be debated and adopted by the European Parliament in Strasbourg on 5 April, sets out the tough line which leading MEPs want the EU's chief negotiator Michel Barnier to take in upcoming negotiations
Describing Brexit as an "unprecedented and regrettable event", it calls for the process to be arranged "in an orderly fashion so as not to negatively affect the European Union, its citizens and the process of European integration".
House of Commons
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Jeremy Corbyn also pays tribute to the emergency services who helped during last week's attack in Westminster.
He asked if Mrs May would be giving the necessary resources to the police who were involved - to which she replied that she could assure him that those resources were available for that "vital work".
Mr Corbyn said there would be a real terms cut in police funding of £330m between 2015 and 2018.
Mrs May says a five to 10% cut is doable, adding that since 2010 crime has fallen by a third to a record low.
House of Commons
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Image source, HocTheresa May begins by naming the victims of last Wednesday's attack and offers her condolence to their friends and families.
UUP MP Danny Kinahan has the first question and asks if "in the extremely improbable event" that a border poll takes place in Northern Ireland, will the government fully support an official remain campaign.
Theresa May says the government's preference is that Northern Ireland should remain in the UK.
On that position "we will never be neutral", she says.
Image source, AFPThe future sovereignty of Gibraltar is "not on the table" following the triggering of Article 50, an MEP whose constituency covers the territory has said.
Gibraltar voted overwhelmingly for Britain to remain part of the European Union with 95.9% of ballots cast against Brexit.
Spanish foreign secretary Jose Manuel Garcia Margallo has reasserted his country's claim to the territory, which was ceded to Britain more than 300 years ago.
But Ashley Fox, MEP for the South West and Gibraltar, said the issue was not "up for discussion".
Quote MessageI have spoken to the first minister of Gibraltar and I know that sovereignty is not on the table. The chief minister has said that Gibraltar will bear any price before it gives up its British sovereignty. That is not a subject for discussion."
BBC News Channel
Former UKIP leader Nigel Farage has said that "after 25 years of campaigning and being considered to be a complete joke for most of it, it's still quite difficult to get into my mind that today is happening, but it is.
"At 12:30 today, when that letter is delivered in Brussels, we will have passed the point of no return."
Mr Farage said he'd been "working too hard" to attend parties, but he quipped: "I might just slip out after 12:30 to celebrate."
He added:
Quote MessageI intend to spend the next two years leading the group in the European Parliament, watching these negotiations and doing my absolute best to ensure that everybody else in Europe understands that it's in their interest, even more than ours, to have a grown up, sensible trade deal."
Former Lib Dem leader Lord Ashdown says there should be a second referendum on the final deal for Brexit - and if the country votes against it there should be a General Election.
He says the prime minister has not chosen a form of Brexit that is advantageous to Britain - "she's chosen the most extreme form of Brexit", he said.
He accuses the government of "hijacking" the issue for its own party's purpose "to keep its rabid anti-European side" happy.
"This is a deal I don't believe the British people voted for", for which she does not have a mandate "and threatens for us to jump over the cliff without the people having a vote", he said.
Conservative Theresa Villiers says some Conservative backbenchers would feel insulted by the peer's assessment of the situation.
As the UK government triggers Article 50, Ritula Shah spoke to two experts about the art of negotiation. Jonathan Powell is a diplomat who was Tony Blair's Chief of Staff and was chief British negotiator on Northern Ireland. William Ury is a Senior Fellow of the Harvard Negotiation Project and author of "The Power of a Positive No: How to say No and still get to Yes".
Former Northern Ireland Secretary Theresa Villiers, a Conservative, tells BBC's Daily Politics she "feel a sense of optimism and anticipation" about Britain leaving the European Union, although she recognises "there will be bumps along the way".
But former Cabinet Office minister Chris Leslie, a Labour MP, said he felt "very sad about it" and wants to hold those in the Leave campaign to account.
He says he doesn't think the decision to quit is irreversible and says the UK should keep its "options open".
House of Commons
Parliament
Image source, HoCBusiness in the House of Commons begins with questions to the International Development Secretary Priti Patel and her ministerial team.
First, however, Speaker John Bercow makes a brief statement on the security of Parliament in the light of last week's attack.
He tells MPs that he has ordered an external and independent review of how the Parliamentary estate is secured.
The findings of the report will be due by the end of April.
Northern Ireland's farming industry and the potential impact of Brexit on the day Article 50 is triggered.
Read MoreTheresa May leaves Downing Street ahead of her Brexit statement
BBC Radio 5 live
All across the UK today, BBC Radio 5 live is finding out what people have to say about Brexit.
Jo Ashburner Farr is the boss of Red Dragon flag makers in Swansea, which makes custom-made flags for clients all over the world. She voted Leave because she thinks being out of the EU will be good for her business and the country: "It's the start of a new beginning, we've been waiting 9 months for this day".
Image source, @markhutchings1In Amber Valley, just a few miles from Derby, we spoke to people in a local diner. The votes cast in that area most-closely mirror the national referendum result last June.
Graham Rowe is a lecturer at Derby University and he voted Remain.
"I am really apprehensive," he said, tucking into a full English. "We are jumping into a big black hole and we have no idea what the future holds."
Image source, @rowanbridgeThe International Chamber of Commerce in the UK has called for all EU countries to "find practical alternatives" to the current relationship as Brexit negotiators get ready to begin.
Secretary General of the ICC, Chris Southworth, said the relationship between the UK and the rest of the EU played an "important role" in driving growth across the world, and any deal struck should not add unnecessary red tape, increase costs, or store up problems for the future.
Image source, FordA senior Ford executive has warned that for the UK to leave the EU without any deal would threaten the competitiveness of the British industry.
Jim Farley said he was hoping for an ambitious deal that maintains strong EU and UK economies, and creates a competitive and investment-friendly environment.
And he said an inability to reach an agreement on trade would be the "worst case scenario" for firms like his.
Quote MessageAny deal must include securing tariff-free trade with the wider Customs Union and not just the EU27, whilst retaining access to the best talent and resources. Given the short timeframe for negotiations, it also is critical that a transitional period is put in place to ensure that customers are not penalised and to maintain free trade."
Image source, EPAFancy being the UK's sole EU commissioner on a day like this?
Sir Julian King, who holds the security portfolio, risks finding himself out of a job in two years time. But, for now, he is getting on with business with his colleagues at their weekly "college" meeting.
Former SNP leader Alex Salmond says politicians celebrating today's events should think about the impact of leaving the EU on young people, who he says supported continued membership in large numbers.
Quote MessageTo a greater extent, it is their future which is being mortgaged by the reckless arrogance of Theresa May and her government."
