First Minister of Scotland Nicola Sturgeon has said if the UK votes to leave the EU, it could trigger a second Scottish independence referendum.

The Andrew Marr Show

Nicola Sturgeon says the new powers in the Scotland Bill do not go as far as promised. She says there is "some distance left to travel" before the financial deal underpinning the Bill is agreed. The Scottish government is "busting a gut" to agree a deal before the middle of February, she says.

The first minister was interviewed at her official residence, Bute House in Edinburgh.

The Sunday Politics is coming up later - bringing more news on Labour's analysis of its general election defeat. One of the party's pollsters tells the programme the official report, led by ex-Foreign Secretary Margaret Beckett, is a "whitewash and a massive missed opportunity". We'll hear more from the pollster,Deborah Mattinson, later. 

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"I certainly will never hide from my background", says old Etonian Zac Goldsmith on his upbringing, predicting it will become a theme of the London mayoral election.

He says he was "dealt a very good hand in life" but had "always sought to play that hand well".

He also dismisses claims by his Labour rival Sadiq Khan that he had tried to make an issue of Mr Khan's Muslim faith by describing him in a leaflet as "radical". It is Labour's policies that are "radical", Mr Goldsmith says.

London's housing situation represents a "political and an economic crisis", Zac Goldsmith says. On the government's plan to demolish and regenerate, he says nobody should be required to leave their home or to pay more.

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First up on Andrew Marr's couch is London mayor candidate Zac Goldsmith, who describes himself as a "non head-banging Eurosceptic" and says he expects "meaningful  reform" to result from David Cameron's discussions with the EU. He says he can be "persuaded either way" on how to vote.

The Sunday papers contain plenty of political stories, including reports , externalof a Tory rift over the EU referendum. Here's a summary of the top stories.

Good morning and welcome to Sunday’s rolling political coverage. The Andrew Marr show is under way – with Nicola Sturgeon and Zac Goldsmith among the guests. You can watch it all on the live coverage tab above.

Question Time and This Week are coming up, and can be watched on this page, using the Live Coverage tab.

Earlier, the fallout from the Alexander Litvinenko inquiry saw David Cameron promise tougher action against Russia 

The PM is at the World Economic Forum in Davos, where he has been speaking about the EU referendum, saying he is not "in a hurry" to reach a deal next month.

Labour, meanwhile, floated the idea of giving employees the right to take over their companies if they are sold, dissolved or floated on the stock market.

There will be plenty more from Davos on Friday, and we'll have all the news and reaction here.

Image source, Reuters/Olympic Delivery Authority Board

A key member of Jeremy Corbyn's inner circle resigned because of the "pressures and demands of the job on his family life", Labour says.

The party said Neale Coleman, executive director of policy and rebuttal, remained in talks about working with Mr Corbyn "in an advisory and support role".

Mr Coleman previously worked for Ken Livingstone and Boris Johnson during their terms as London mayor.

He joined the Corbyn team in September.

Read the full story

David Cameron says the UK is to take tougher action against Russia following the Alexander Litvinenko inquiry.

The ex-spy was poisoned with polonium-210 while in London in 2006, "probably" on the approval of Russian President Vladimir Putin, a report found.

Mr Cameron called the murder "absolutely appalling" and said the inquiry "confirms what we always believed".

The prime minister's official spokeswoman had earlier said that Downing Street was taking the findings "extremely seriously".

"The conclusion that the murder was authorised at the highest levels of the Russian state is extremely disturbing," she said.

"It is not the way for any state, let alone a permanent member of the UN Security Council, to behave. Regrettably, these findings confirm what we and previous governments already believed."

Read the full story

Image source, AFP

The government has announced Tube staff will fall within the definition of "important services" which have to meet stricter conditions for striking.

Unions representing Tube workers will have to meet minimum thresholds of turnout and support in order to strike.

The change was welcomed by Conservative mayoral candidate Zac Goldsmith, who said it would avert "spurious" action.

Labour candidate Sadiq Khan claimed the move had been timed to "destabilise" negotiations over the Night Tube.

Read the full story

Defence Secretary Michael Fallon has told the Sevenoaks Chronicle, external any EU reforms negotiated by David Cameron need to be "significant and substantial" for him to vote to stay in.

Read the full story, external

Joanne Gallacher
Political reporter, BBC Shropshire

Telford MP Lucy Allan has pulled out of an interview with the BBC because she wasn't allowed to veto the questions she'd be asked.

The Conservative politician was due to be interviewed for Sunday Politics in the West Midlands tomorrow.

However, I'm told she wanted to "dictate the parameters of the interview". When this was refused she pulled out this morning.

Mrs Allan is currently embroiled in a row with Labour councillors after she claimed some were "henchman and thugs" and last month admitted modifying a message from a constituent.

The Conservatives have put out a response to shadow chancellor John McDonnell's speech which floated the idea of giving employees the right to take over their companies if they are sold, dissolved or floated on the stock market.

Chief Secretary to the Treasury Greg Hands claimed Labour represented "a threat to our economic security".

Daily Telegraph columnist Allister Heath has called on Conservative Eurosceptic "big beasts" to back the campaign to leave the EU., external

"Britain deserves better than whatever pathetic deal is on offer from the EU, and you know it," he says.