Rachael Maskell's departure is the 31st exit from Jeremy Corbyn's Shadow Cabinet since he became leader in September 2015 and triggers the fourth Shadow Cabinet reshuffle. 

January 2016:

1.       Michael Dugher, Shadow Culture

2.       Catherine McKinnell, Shadow Attorney General

June 2016

3.      Hilary Benn, Shadow Foreign (or sacked)

4.       Heidi Alexander, Shadow Health

5.       Gloria de Piero, Shadow Youth

6.       Vernon Coaker, Shadow Northern Ireland

7.       Lucy Powell, Shadow Education

8.       Seema Malthotra, Shadow Chief Sec

9.       Ian Murray, Shadow Scotland

10.   Lillian Greenwood, Shadow Transport

11.   Kerry McCarthy, Shadow DEFRA

12.   Charles Falconer, Shadow Justice

13.   Karl Turner, Shadow Attorney Gen

14.   Chris Bryant, Shadow Leader of the House

15.   Lisa Nandy, Shadow DECC

16.   Owen Smith, Shadow DWP

17.   Angela Eagle, Shadow BIS

18.   Maria Eagle, Shadow Culture

19.   Nia Griffith, Shadow Wales*

20.   Luciana Berger, Shadow Mental Health

21.   Lord Basam*

22.   Baroness Smith*

23.   John Healey, Shadow Housing*

24.   Pat Glass, Shadow Education

*Indicates they returned to the Shadow Cabinet

October 2016

25.   Rosie Winterton, Shadow Chief Whip

26.   Kelvin Hopkins, Shadow Culture

27.   Paul Flynn, Shadow Leader of House & Wales

28.   Grahame Morris, Shadow Local Govt

January 2017

29.   Jo Stevens, Shadow Wales

February 2017

30.   Dawn Butler, Shadow Diverse Communities

31.   Rachael Maskell, Shadow DEFRA

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A second division follows immediately, as MPs vote on whether to pass the bill at second reading and enable it to go forward for further consideration in Parliament.

The government's plan to get Brexit talks started faces its first parliamentary test in the Commons.

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The SNP's amendment opposing the bill is defeated by 336 votes to 100 - a majority of 236.

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The first of tonight's divisions is called, on the SNP's "reasoned amendment".

This opposes the bill's second reading and gives reasons why. In full, it reads:

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Image source, bb

Minister David Jones says the government was clear that the referendum "outcome would apply to the whole of the United Kingdom".

He insists that the UK government will work with the devolved administrations in Scotland, Wales and Northern Ireland.

To citizens of other EU states, he says: "You will still be welcome in our country, as we trust our citizens will still be welcome in yours."

Once the UK has left the EU, he claims, "We will be an outward-looking, bold and ambitious country".

He finishes by urging MPs to back the bill and "trust the people".

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"What we are considering is the most straightforward possible bill," says Brexit minister David Jones.

The bill is about triggering the process to leave the EU, not about the terms of a future deal, he says.

He urges MPs to show that they respect the referendum result "by supporting this small, but important, bill".

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"This is how we must proceed," Jenny Chapman says, "not for the 52% not for the 48% but for 100% of the people of Britain."

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Shadow exiting the EU minister Jenny Chapman winds up for Labour, saying the EU referendum produced "a close vote but a clear decision".

She tells the House: "We accept the outcome of the referendum and therefore we must consent to allow the process of leaving the European Union to begin."

She says Labour will "hold this government to account every step of the way" and urges MPs to support the opposition's "reasonable" amendments to the bill, when it reaches committee stage next week.

If ministers "fail to achieve a deal worthy of our country they will not achieve our consent", Ms Chapman says.

"The prime minister must achieve the deal that she says she can."

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Labour leader Jeremy Corbyn responds to Dawn Butler and Rachael Maskell's decision to quit the shadow cabinet to vote against the government's Brexit bill.

He says: "I would like to thank Dawn and Rachael for their work in the shadow cabinet. They are great assets to the Labour Party and to our movement. 

"MPs have a duty to represent their constituents as well as their party, and I understand the difficulties that MPs for constituencies which voted Remain have in relation to the European Union withdrawal Bill. 

 "However, it is right that the Labour Party respects the outcome of the referendum on leaving the European Union. 

"We have said all along that Labour will not frustrate the triggering of Article 50 and to that end we are asking all MPs to vote for the Bill at its second reading tonight.

"I wish both Dawn and Rachael well and look forward to working with them in the future." 

Mark D'Arcy
Parliamentary Correspondent

I've got five take-outs from the Article 50 bill so far.

1: No retreat, baby, no surrender

There may be 101 pages of amendments down so far, but the government is in no mood to take any of them on board; on the contrary, their aim is to repel boarders, to the point where they would even resist the one amendment being mooted by the Brexiteer camp, which would aim to forbid ministers from accepting any extra time to extend the two year negotiating window specified by the EU's Lisbon Treaty. 

Ministers do believe that EU negotiator Michel Barnier's strategy is to enmesh the UK in a long-term negotiating limbo, perhaps including a post-Brexit transitional deal, but they don't want their hands tied.

Read about the other four 

Rachael Maskell, who was shadow environment secretary, explains her decision to quit the shadow cabinet to defy the Labour leadership in the Brexit vote. She says: "The UK is no longer being offered a 'people's Brexit' but a 'Theresa May Brexit', which goes far beyond just leaving the European Union, as voted on at the referendum last June."