David Cameron tells Marr he's "hopeful" of an EU deal in February and referendum is likely after September
He says he'll stay on as PM - and "do everything necessary to make it work" - if UK votes to leave EU
Shadow justice secretary Lord Falconer urges Labour to "come together" after recent reshuffle
Labour MP Alison McGovern has quit a party policy group over differences with the leadership
Amid the various political interviews ongoing today, in Paris a memorial has just been held to remember those who died in the Charlie Hebdo attacks last year.
The French ambassador to the UK Sylvie Bermann tells Dermot Murnaghan: "What happened was an act of war, and so we had to defend ourselves and that's why we are striking in Syria."
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Shadow work and pensions secretary Owen Smith tells 5 live's Pienaar's Politics that Labour's policy remains to ban EU migrants from claiming in-work benefits for two years.
Brandon Lewis minister of state for housing
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Over on Sky News, presenter Dermot Murnaghan is set to interview former defence secretary Liam Fox and Liberal Democrat Norman Lamb.
Meanwhile, Conservative MP David Davis and Labour's Owen Smith are on 5 live's Pienaar's Politics.
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Ross Hawkins, BBC political correspondent
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"I often have a drink in the evening after a long day," says the PM in relation to the new alcohol guidelines, which recommended that people - both men and women - drink no more than 14 units in a week.
The PM says "yes" when Marr asks him if he will remain as prime minister if the UK votes to leave the EU.
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PM now speaking about the people who were recently put to death in Saudi Arabia. He says: "I condemned it roundly on the television."
"A very big export drive is a key part of our plans," says David Cameron when pressed by Marr on the economy.
Cautiously, he later adds: "I worry about everything - that's my job."
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"It's right to warn of the difficulties we face in the world," - is how the PM explains away a change of rhetoric in relation to the UK economy over the past six months by Chancellor George Osborne.
Nigel Farage - leader of UKIP
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The PM says "people can feel trapped in poverty" by living on some housing estates in Britain.
"I think it's time to demolish the worst of these," he says, while adding that in some cases they don't provide a huge number of homes.