The UK and EU begin a new relationship on 1 January 2021.

Gina Miller is the figurehead of two of the legal challenges to the Brexit process - but who is she?

Here's a round-up of the stories that have topped the news in politics today...

• Theresa May is urged to reject Donald Trump's comments about torture when she becomes the first world leader to meet the US president 
• The government publishes draft legislation that will allow the UK to start the process of leaving the EU
• As Theresa May prepares to meet new US President Donald Trump, the BBC looks back at some first encounters of UK prime ministers and new US presidents
• Holyrood's consent is likely to be needed for the Great Repeal Bill which unpicks EU laws from the UK, the Scottish Secretary says
• Ministers are trying to do too much and there is a "sense of overload" in Whitehall even before it grapples with the challenge of Brexit, it is claimed  
• In non-Brexit news...Conservative MP Bob Stewart says he was "kind of a torturer" during his time as a soldier in Northern Ireland's Troubles in the 1970s
• Strong consumer spending helps the UK's economy to grow faster than expected at the end of last year
• The government drafts in senior officials to support the Commonwealth amid concerns over the way it is being run, the BBC learns.  

A shadow minister quits after being told to back the new Article 50 bill, hours after it is introduced.

Labour has tabled a number of amendments to the Article 50 bill, which will kickstart the UK's exit from the EU.

Jeremy Corbyn has ordered his MPs to back the European Union (Notification of Withdrawal) Bill, but says the amendments aim to prevent Britain becoming a "bargain basement tax haven off the coast of Europe".

Labour says it also aims "to improve the process" and ensure Parliament "is able to hold the government to account throughout the Brexit negotiations".

The amendments include: ensuring the Commons has the first say on any proposed deal, protection for workers' rights, full tariff and free access to the single market, guaranteed legal rights for EU nationals living in the UK, and a requirement for Brexit Secretary David Davis to report to the House every two months on progress during Brexit negotiations.

Labour's shadow Brexit secretary Keir Starmer says the amendments "will significantly improve" the government’s bill.

“The Article 50 bill will be the start, not the end of the Brexit process and Labour will hold the government to account all the way," he said.

Labour leader Jeremy Corbyn urges his MPs not to "block" the Brexit bill when it goes before the Commons.

Image source, PA

Labour shadow business secretary Clive Lewis says he will vote for the Article 50 bill that will trigger the UK's exit from the EU.

He said: 

BBC News Channel

Labour MPs "are in something of a dilemma" over whether to back Jeremy Corbyn and vote for Article 50 - or go against the three-line whip he has imposed, BBC chief political correspondent Vicki Young has said.

The Labour leader urged his party to "unite around the important issues of jobs, economy, security, rights, justice".

But he added:

Green Party of England and Wales co-leader Caroline Lucas has appealed to Labour MPs to join her in voting against the "premature triggering" of Article 50 - which kickstarts the UK's exit from the EU.

She has also tabled a further amendment, alongside Labour's Geraint Davies, the SNP's Stephen Gethins and SDLP's Mark Durkan, seeking to prevent a further reading of the bill, which will reject it altogether.

She said:

Rob Mayor
Black Country Political Reporter, BBC WM

A university has launched a Centre for Brexit Studies alongside a wishlist of things the West Midlands needs to get from the government in order to make a success of leaving the EU.

Birmingham City University (BCU) hopes the new centre will promote engagement between Leave and Remain standpoints, while providing collaborative opportunities for businesses and professional groups.

The report meanwhile makes three key points. It claims more investment is needed in infrastructure, such as expanding broadband services, and to close the skills gap so there are enough people to fill roles in the high-tech manufacturing sector, which is still struggling to recruit people.

Another area for improvement, it says, is transport - tackling a bottleneck slowing down how products fashioned in the West Midlands get to their destination.

Professor Alex de Ruyter heads up the Centre for Brexit Studies and said the way the UK measured its economy needed to change because the West Midlands currently is "overlooked" for investment.

The interests of Wales will be reflected, the Brexit secretary says, as the bill to trigger Article 50 is published.

Image source, AFP/Getty

The UK prime minister must not to shy away from raising human rights issues with US President Donald Trump, Amnesty International has warned.

The charity's UK director Kate Allen said:

BBC News Channel

Former Labour minister Ben Bradshaw says he will not be voting to trigger Article 50 - which begins the UK's exit from the EU - despite his leader Jeremy Corbyn making it a three-line whip issue.

Urging all MPs "to think very carefully before they start to vote", he said:

Asked if he thought Mrs May should meet US President Donald Trump, Mr Bradshaw added: "It's demeaning that she seems so desperate to be the first foreign leader to meet the most unpopular American president in history, who has just said he supports torture because she's desperate for a trade deal."