Apparently Extinction Rebellion have form for this kind of protest.

The BBC's Andrew Sinclair, who covers politics in the east of England, says the group invaded a meeting at Norfolk County Council meeting in February.

The group has drawn attention to their latest protest on Twitter, describing the climate and ecological crisis as the "elephant in the room".

House of Commons
Parliament

Conservative MP Nick Boles is speaking now in favour of his 'Common market 2.0'.

He says it is the compromise of choice.

The proposal means joining the European Free Trade Association and European Economic Area, with countries such as Norway.

Under this option, the UK would remain part of the EU single market and would retain freedom of movement, so British citizens would keep the right to live and work in the EU and vice-versa.

In the last round, 188 MPs voted for this plan and 283 voted against.

Westminster Hall

In the debates on the Brexit petitions going on in Westminster Hall, Tory MP Julian Lewis presses the case for leaving on World Trade Organization terms.

He says: "I, together with 158 of my colleagues - more than half of the Tory party - voted that we should leave on WTO terms and I think that should be the right solution."

But Independent MP Heidi Allen says another public vote would be "healing".

"Involving the entire country in the decision... there can be nothing more healing than that," she says.

"Everybody’s voice is equal because that is a democracy."

BBC Radio 5 Live

Speaking on Radio 5 live, Conservative Andrew Bridgen says he is “very cross” about John Bercow's choice of motions.

Mr Bridgen says the Speaker has “ridden roughshod through all the conventions of the House of Commons and in my view he’s ripped up every book of impartiality from the Speaker’s handbook”

More on the unusual intervention in the Brexit debate.

A dozen or so climate change protesters wearing just thongs and with slogans painted on their backs have invaded the public gallery in the Commons, says the BBC's Chris Mason.

Labour MP Stephen Doughty refers to the disturbance in the chamber as Commons Speaker John Bercow urges MPs to continue with their business.

If you are just joining us, MPs are this evening trying to decide which Brexit options they favour.

The votes are non-binding but are intended as a way to find a strategy that can gain majority support.

These are the four [of eight] options they are considering today, as selected by Speaker John Bercow:

• Motion C: Customs union
• Motion D: 'Common market 2.0'
• Motion E: confirmatory public vote
• Motion G: parliamentary supremacy

Conservative MPs have been given a free vote on the motions which means they won't be told by party bosses which way to go.

The cabinet has been told to abstain.

Earlier, Labour MPs were urged to back Motion D, which has been described a plan to keep the UK in a Norway-style relationship with the EU.

House of Commons
Parliament

Labour MP Peter Kyle is making the case for the public to be given the final say on whatever deal is approved by Parliament.

He says his idea of a confirmatory referendum would "bring this House together" at a moment when Parliament "is in peril" and in danger of losing the trust and esteem of the public.

He wants to bring to an end the current situation where different groups are "going to war with each other".

"We face a stark choice. Do we end the war of positions where one side capitulate, do we continue with the deadlock or do we choose to progress?"

Westminster Hall

Battersea MP Marsha de Cordova says it is "about time" the PM "brought back her deal to the public with the options to remain".

In response, her Labour colleague, Catherine McKinnell, says: "I’m prepared to accept there are many people in my constituency who voted to leave, which is why my opinion is if this Brexit deal is the best deal available… the government should have their courage of their convictions and put it back to the people."

Image source, Dominic Lipinski/PA Wire

DUP leader Arlene Foster has rejected claims her party was in negotiations with Labour on the Common Party 2.0 model.

Labour MP Stephen Kinnock earlier said he and colleagues were trying to win the DUP's support for the proposal.

Mrs Foster also rejected reports that there was a 7-3 split among her party's MPs, with seven in favour of Mrs May's withdrawal agreement, saying "there's no splits within the Democratic Unionist Party".

Asked if the party would accept a softer Brexit if it was without a backstop, she told a press conference in Belfast: "We have a very simple way of judging all of this. It's what will protect the Union and what will respect the referendum result and that's always been our position."

She added that the Union would "always be our first priority".

House of Commons
Parliament

When MPs vote in favour of the Business of the House motion it constituted the 18th government defeat in this Parliament.

Despite the government whipping its MPs to oppose the motion, 33 Conservative MPs voted in favour.

Four Labour MPs rebelled against their own party by voting against the motion.

Seven DUP MPs, four Labour MPs and 18 Conservatives abstained.

House of Commons
Parliament

Conservative Ken Clake contends that one of the benefits of his proposal for a customs union is that "it would also mean the DUP's objection to the Northern Ireland backstop vanishes".

The DUP's Sammy Wilson argues that "a customs union alone does not resolve the issue."

He says there would still be regulatory checks on the border between Ireland and Northern Ireland.

Brexit Basics: The Northern Ireland backstop

Westminster Hall

Speaking in the Westminster Hall debate, Labour's Catherine McKinnell says that "no petition has received the number of signatures this petition has", referring to the call to revoke Article 50.

She says this petition "doesn't replace our normal democratic processes".

"It simply is a reflections of level of interest in this issue and strength of feeling from the public," she says.

"We ought to be very grateful that they have their means to make their voices heard.

"This petition is a roar."

House of Commons
Parliament

Motion G was proposed by the SNP's Joanna Cherry.

This option offers a series of steps to prevent the UK leaving the EU without a deal. First, it requires the government to seek an extension if a deal has not been agreed two days before the deadline for leaving.

If the EU does not agree to an extension, on the day before the UK was due to leave, MPs would be asked to choose between a no-deal Brexit or revoking Article 50 to stop Brexit altogether.

In the event of revoking Article 50, an inquiry would be held to find out what type of future relationship with the EU could command majority support in the UK and be acceptable to Brussels.

MPs previously voted against a proposal to cancel Brexit by Joanna Cherry, but have not considered this plan before.

House of Commons
Parliament

Motion E was proposed by Labour's Peter Kyle and Phil Wilson.

This gives the public a vote to approve any Brexit deal passed by Parliament, before it can be implemented.

Tabled last time by Labour former minister Dame Margaret Beckett, this option won the highest number of votes, with 268 MPs for and 295 against.

House of Commons
Parliament

Motion D proposed by Conservative Nick Boles has also been selected by the Speaker

This proposal would mean joining the European Free Trade Association and European Economic Area, with countries such as Norway.

It means the UK would remain part of the EU single market and would retain freedom of movement, so British citizens would keep the right to live and work in the EU and vice-versa.

In the last round, 188 MPs voted for this plan and 283 voted against.