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

A summary of which MPs have publicly said they will support either the Remain or Leave campaigns in the forthcoming EU referendum.

With an EU referendum on the horizon, we look at the main economic arguments for and against Britain's membership.

Here's a recap of the main headlines so far this Friday.

• Iain Duncan Smith says the "spin and smear" tactics being used by the campaign to stay in the EU risk long-term damage to the government.
• Only the Tories can challenge the SNP and prevent Scotland becoming a "one party state", David Cameron says.
• An inquest into the death of a young Conservative activist will not look at allegations of bullying in the party, a coroner rules.
• Wales is "crying out for new leadership" after 17 years of Labour rule, Plaid Cymru leader Leanne Wood says.
• The Home Office is told by MPs to get a grip on a scheme to secure the UK's borders, which is set to be at least eight years late and cost £1bn.  

Referendum campaigning is set to continue apace over the weekend, with a major Grassroots Out rally in Northern Ireland. There is also plenty to look forward to on the weekend talk shows, with Boris Johnson and Germany's finance minister Wolfgang Schaeuble among Andrew Marr's Mothering Sunday guests. 

Plaid Cymru says its election manifesto pledges will be independently verified.

Comments that Labour leader Jeremy Corbyn reportedly made about prostitution are causing a bit of a stir. The Labour leader reportedly told students at Goldsmith's University on Thursday that he was personally in favour of decriminalising sex work. This is how the Guardian is reporting, external what he said. 

Harriet Harman, Mr Corbyn's predecessor as Labour leader, and other Labour MPs have now responded. Ms Harman has championed a campaign to criminalise those who pay for sex and seems none too pleased about what her party leader has been saying. 

Helen Lewis talks claims of Project Fear as she reviewed the week in Westminster.

Moodbox vote on which politicians can be trusted over the UK's future links to the EU.

The Electoral Commission has begun the process for designating lead campaigners for either side in the EU referendum. The watchdog will make a decision by 14 April at the latest. 

The eastern region sees visits from high profile campaigners including the Prime Minister promoting the case to remain in the European Union.

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Lord Tebbit also suggests David Cameron would stand down as prime minister if the UK votes to leave the EU.

Mr Cameron has already said he will not seek a third term as PM, and Lord Tebbit says that if there was a Leave vote, "he would I suppose feel that he probably should (stand down)" - saying it would be hard for him to negotiate the UK's exit "having said it would be a disaster if we did leave".

Michael Fallon dismissed Nicola Sturgeon's claim that theConservatives feared an SNP campaign against renewal of the nuclear weapons system in the run up to May's Holyrood election.

Image source, PA

Mr Fallon said: Tories "stand alongside the Scottish trade unions in wanting to see those jobs and skills retained in Scotland".

The UK defence secretary made the comment during a visit to small defence software firm SeeByte in Edinburgh.

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Former Conservative Party chairman Lord Tebbit says there is a "good deal of silliness" coming from the Remain campaign. If voting to leave the EU is such a "leap in the dark", he asks, why was David Cameron willing to consider if if his reform demands had been rejected?

Andrew Neil spoke to the SNP's Stephen Gethins and Conservative Liam Fox about claims of negative campaigning.

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Labour MP and former head of the Public Accounts Committee Margaret Hodge says Facebook's tax announcement may be "a small step in the right direction".

But she says it is "shrouded in secrecy" with "so many unanswered questions" it is hard to know whether the company is paying "a proper amount" of tax.