Image source, PA

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".

Read more here.

Image source, Getty Images

David Cameron is being urged to hold an emergency cabinet meeting as soon as the crucial summit on the UK's EU renegotiations concludes next month.

And the House of Commons could even be recalled over the weekend to debate the likely deal and a future referendum.

Some cabinet ministers fear if a deal is done on Friday 19 February, they will not meet until the Tuesday to decide the government's position.

That would give those fighting to stay in the EU a head start in campaigning.

Read more here.

Image source, AP

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.

The talks come ahead of an EU summit next month where he hopes to finalise his package of reforms.

Meanwhile, Mr Cameron is being urged by ministers to hold an emergency cabinet meeting straight after that meeting.

Read more here.

Welcome to our rolling coverage of Thursday's politics.

Prime Minister David Cameron will address the WEF in Davos today. He will focus on EU reforms, in particular on work to increase competitiveness.

Labour's John McDonnell will give a speech later on proposals for new employee rights.

But first a look at some of the main UK politics stories.

That's all for our live coverage. Thursday promises to be a busy day with David Cameron and George Osborne rubbing shoulders with the great and the good in the Swiss ski resort of Davos, shadow chancellor John McDonnell making a major speech and the report into the death of Alexander Litvinenko being published. Please join us then. 

BBC Newsnight

Two founding members of the SDP have speculated that there could be another breakaway from the Labour Party. 

Former Labour foreign secretary Lord Owen told the BBC's Newsnight critics of Jeremy Corbyn should "fight like hell" for the next two years but that creating a new party was an option. 

Baroness Williams said she saw a new party of the centre-left party reviving "the concept of the SDP". 

She said Mr Corbyn was "an idealist" being "manipulated" by others.

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Here's a round-up of the top stories so far on Wednesday:

• David Cameron and Jeremy Corbyn clash at Prime Minister's Questions over the axing of student grants and bursaries for nurses in England
• Conservative ex-minister Crispin Blunt has told MPs he is a user of the popper recreational drug and a ban on its supply would be "fantastically stupid"
• The UK is battling EU plans to share the "burden" of refugees more evenly among member states
• Critics of Labour's "Ed Stone" will have to wait a bit longer to find out how much was spent on the widely-mocked monument listing its election pledges
• Civilian recruits will help police solve cybercrime under an expansion of the role of volunteers in England and Wales, the home secretary has said
• The sale of the UK government's stake in the Eurostar train service is "further evidence" of assets being undervalued, according to MPs 
• Scrutiny of academy schools is "confused, fragmented and lacking in transparency", say MPs in a report.  

Labour MP Paul Flynn, a long time supporter of drugs law reform, has described the Psychoactive Substances Bill, which received an unopposed Third Reading earlier, as "a foolish bill based on prejudice and not based on evidence".

BBC Radio 4

Tom Edgington
BBC Radio 4 Political Producer

Crispin Blunt MP tells BBC Radio 4's PM programme about his own personal experience of using poppers - and why he chose to speak out in the Commons. He said:

Conservative Steve Brine says the Psychoactive Substances Billl "is the blanket ban that we promised".

SNP's Anne McLaughlin said it was clear "all of these substances are dangerous and that's the message we're getting out there now".

She said her intention was to "protect people's health and protect them from being criminalised by a foolish mistake".

During third reading debate on the Psychoactive Substances Bill, shadow home office minister Lyn Brown said she was disappointed the government had decided not to place poppers on the exemption list of legal highs.She said:

The World at One
BBC Radio 4

Energy companies should do "more" to reduce their prices for customers, Energy Secretary Amber Rudd has said.

Responding to the news that energy firm E.On had cut gas prices by 5%, Ms Rudd told presenter Edward Stourton that it was a "good start" but there needed to be "more to go".

House of Commons
Parliament

Over in the Commons, MPs have voted not to exempt poppers from a ban on psychoactive substances, or so-called legal highs. They rejected a Labour amendment to the government's Psychoactive Substances Bill by 309 votes to 228, a majority of 81.

House of Lords
Parliament

The government has been defeated on a Labour amendment to the Trade Union Bill.

Peers voted by 327 to 234 to refer two clauses dealing with political funding to a select committee for further consideration.

Labour argues that the measures, requiring union members to opt in to paying a levy, would cost it £6m a year and damage democracy.