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Investment bank Goldman Sachs has reportedly given a "six figure" donation to the campaign to keep the UK in the European Union.

The US bank is said to have backed Britain Stronger In Europe, a cross-party group leading the In campaign.

Britain Stronger In Europe said it would not confirm the donation which Sky News, externalsaid was a "substantial" sum.

It comes as David Cameron prepares to tell business to "make the case" for the staying in a "reformed EU".

Leave.eu, one of the groups campaign for EU exit, dismissed Goldman Sachs' involvement.

Its founder, UKIP donor Arron Banks, tweeted: "No surprise to those of us who have said all along EU referendum will be a campaign of British people against the establishment of international bankers, multinational corporate tax dodgers and out-of-touch politicians."

Read more here.

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The long-awaited findings of a public inquiry into the killing of former Russian spy Alexander Litvinenko are due to be released by a judge.

Mr Litvinenko died aged 43 in London in 2006, days after being poisoned with radioactive polonium-210, which he is believed to have drunk in a cup of tea.

Two Russian men, Andrei Lugovoi and Dmitry Kovtun, have denied killing him.

The judge will decide whether to name any culprits and whether any elements in the Russian state were responsible.

Read more here.

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Prime Minister David Cameron is to urge business leaders to back the UK staying in a reformed European Union, in a speech at the World Economic Forum.

Mr Cameron will hold discussions with political and corporate leaders at the annual gathering in Davos, Switzerland.

He then hopes to finalise a package of reforms at an EU summit next month.

Downing Street said a cabinet meeting would be held "soon after" any deal following concerns a delay could assist the campaign to remain in the EU.

Read more here.

A report into cases of sexual abuse by Jimmy Savile linked to the BBC is set to criticise the corporation's culture, according to a leaked draft.

News website Exaro, external says Dame Janet Smith's draft report says the BBC had a "deferential culture", "untouchable stars" and "above the law" managers.

But Dame Janet does not believe the BBC can be criticised for not uncovering his "sexual deviancy", Exaro said.

The review said it was "disappointed" Exaro had published the "early draft".

Read more here.

Transport for London is to take over running London's suburban rail network, the Evening Standard reports, external.

"Embattled commuters should finally get more frequent and reliable train services," the article says.  

People who live in cities and have a relatively high level of disposible income are over-represented in intake into the Labour party since the general election, the Guardian said earlier, external. The newspaper cited a leaked Labour document.

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David Cameron is to urge big business to get behind his EU renegotiation as he embarks on a three-day diplomatic offensive at the World Economic Forum.

In an EU summit next month he hopes to finalise a reform package to put to UK voters in an in/out referendum.

But what will the referendum involve? Here's a handy BBC guide.

Labour are considering giving employees the right to takeover their companies if they are sold, dissolved or floated on the stock market.

The proposal will be contained in a speech to be delivered in Manchester by the shadow chancellor John McDonnell.

Labour has already announced its intention to return the railways to public ownership, but when it comes to the wider economy, the shadow chancellor will say that that he favours an expansion of co-operative enterprises rather more widespread state control.

John McDonnell will signal support for giving employees in companies which are about to be sold off -or floated on the stock exchange - the first option to purchase the company.

And he'll consider adopting the Italian government's policy of offering funding to help employee-owned enterprises to get off the ground.

This is in part a response to the Conservatives' attack that Labour under Jeremy Corbyn would take Britain back to an era of state ownership and strikes.

The real issue for the Litvinenko inquiry is who was behind the killing of the former spy, and whether responsibility can be proved to lie with the Russian state, says BBC security correspondent Gordon Corera.

If Russian state responsibility is alleged, there is likely to be pressure on the UK government to take action, he says.

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The inquiry into the killing of former Russian spy Alexander Litvinenko will issue its final report later. The former intelligence officer died in London in 2006, poisoned by tea laced with radioactive Polonium.

The question of whether the Russian state was involved is expected to form a crucial part of the report, which has been written by a judge, Sir Robert Owen.

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A key aide to Labour leader Jeremy Corbyn is reported to have quit.

Director of policy and rebuttal Neale Coleman (pictured left) was said by The Times to have resigned following rows within the leadership team.

The appointment of Mr Coleman - a respected senior City Hall adviser to Ken Livingstone who was retained by Boris Johnson to oversee the 2012 Olympics - had been applauded by moderate MPs who said he "commands widespread respect".

Downing Street say they expect to hold a cabinet meeting "soon after" any EU deal secured by Mr Cameron  - possibly at next months' EU summit.

Critics had feared there would be no cabinet meeting until several days after a deal which it was claimed would give the Prime Minister a crucial advantage at the start of the campaign.

This morning Number 10 said while they could not guarantee any particular day or time for a post summit cabinet meeting -  one would be held "in good order" after any agreement.

Opponents have warned that because Ministers are not allowed to begin campaigning until the Government has decided on its position at a cabinet meeting, this could restrict them in the first few days from opposing any deal reached by Mr Cameron.

They have argued it would give Mr Cameron a crucial advantage in the first 48 hours or so to set out the case for his deal unchallenged.

Number 10 say they are unwilling to give a specific time for a cabinet as they do not know the circumstances of any deal and when a summit might conclude.    

Today Programme
BBC Radio 4

How will the Prime Minister tell the Cabinet about whatever deal he secures in Europe?

BBC assistant political editor Norman Smith says there are growing calls from opponents of the UK's membership of the EU that there must be a full cabinet meeting "as soon as possible after Mr Cameron secures any EU deal." Their concern is that if there isn't a meeting Mr Cameron "could enjoy a critical and decisive advantage" in the first 48 hours of the campaign.

It is certainly a gear change.

Arriving at the World Economic Forum in Davos today, the Prime Minister will put European Union reform at the heart of his appearance, demanding that business leaders "make their voice heard" on the issue.

He will also say that chief executIves should directly back the UK staying in a reformed EU.

Last year there was scepticism among some in the government about the role of business in the debate. Some said that businesses should remain silent until closer to the referendum on membership of the EU.

That time appears to be now, and the Prime Minister's demand for vocal business support will only heighten speculation that the referendum is fast approaching, either in the summer or early autumn.

Mr Cameron will say that the reforms he is demanding will tear down trade barriers and create higher levels of economic growth.