That's it for the leaders' exchanges. Over to SNP Westminster leader Angus Robertson who also pays tribute to Chris Martin.

His question is on Syria, ahead of David Cameron setting out the case tomorrow for airstrikes against IS.

"How many troops and from which countries does the PM have in his plan" to defeat so-called Islamic State in Syria? he asks.

The PM says that MPs need to ask whether they can afford to wait until a political settlement is reached. His view, he says, is no.

The UK government is going to put more money into women's charities, including those that fight the "appalling" crimes of domestic violence and rape, says the prime minister. The government is also doing more than any other to prevent forced marriages and the "horrors" of female genital mutilation.

Jeremy Corbyn now raises the issues of domestic violence and asks why one third of women referred to refuges in England are being "turned away". David Cameron says Mr Osborne will have something to say about funding women's charities in his Autumn Statement later. He says the government has a "good record" on helping women.

Jeremy Corbyn continues to question the PM over renewable energy, prompting David Cameron to say the government is doubling investment in renewable energy, and says more than one million homes were fitted with solar panels in the last Parliament. 

London's FTSE 100 index is still in positive territory. It's now 0.9% higher with housebuilding firms still leading the way. We'll keep an eye on market reaction once the chancellor begins his statement in around 20 minutes.

The Labour leader says cutting support for solar panels and scrapping the Green Deal, among other government policiesm, has harmed progress on renewable energy. But David Cameron defends the government's record, including reducing the subsidy for solar panel, saying people's energy bills would have gone up otherwise.  

Jeremy Corbyn challenges the PM to confirm whether Britain is likely to miss its target to get 15% of energy from renewables by 2020. David Cameron says renewable energy trebled under the coalition government. It also spent "record sums" helping developing governments to go green, he adds.

Labour leader Jeremy Corbyn expresses his condolences to Chris Martin's family and pays tribute to his work.

Turning to his questioning of the prime minister - he asks the PM if, ahead of the Paris climate talks, he'll commend Labour councils for promoting green energy and urge Conservative councils to do the same. David Cameron responds by saying what the government has been doing in this area.

David Cameron is on his feet in the House of Commons. He begins by informing MPs that his principle private secretary, Chris Martin, died of cancer this morning, aged 42. The PM says he was one of the most loyal, and dedicated public servants he has come across, and that he "went to the ends of the earth and back again" for all those he worked for. Mr Cameron pays tribute to his family and friends.

BBC political editor Laura Kuenssberg says she's not sure there's going to be one today. She says to expect some "surprises" but she understands there is to be "no jolly give away" from the chancellor.

There's the not-so-small matter of Prime Minister's Questions to get through before we hear from George Osborne today. David Cameron will be on his feet taking questions from Labour leader Jeremy Corbyn and MPs, at noon. Stay tuned, as we bring you all the latest lines.