jeremy corbyn david cameron pmqs
The House of Commons showdown is one of the most hotly-anticipated political duels of the yearGetty

Jeremy Corbyn will face the political bear pit that is Prime Minister's Questions (PMQs) when he goes head-to-head with David Cameron on 16 September. The new Labour leader will have to tread carefully as the prime minister has been handed some rhetorical ammunition to fire across his dispatch box after Corbyn was criticised for not singing the national anthem during a Battle for Britain commemoration service at St Paul's cathedral on 15 September.

But Labour claimed the socialist was standing in "respectful silence" after the party faced a backlash. "As he said in the words issued this morning, the heroism of the Royal Air Force in the Battle of Britain is something to which we all owe an enormous debt of gratitude. He stood in respectful silence during the anthem," a spokesman said. The Conservative leader is also expected to claim that Corbyn is a threat to the UK's economic and national security.

The defence secretary Michael Fallon, who was singing beside Corbyn at St Paul's, has made very similar comments as well. Top Tory and justice secretary Michael Gove also claimed the 66-year-old could win the 2020 general election for Labour and present a "real danger" to the UK's security.

On top of that, the Tories have launched an American-style attack advertisement on video website YouTube. The film draws on Corbyn's remarks that Osama Bin Laden's death was a "tragedy" and his description of terror groups Hamas and Hezbollah as friends. "Labour are now a threat to our national security," the video concludes.

But Corbyn will not be defenceless when he leads the charge against Cameron. The new Leader blasted the prime minister and his government over their Trades Union Bill, which would enforce a minimum turnout threshold of 50% for strike ballots.

The left-winger compared the draft legislation, which passed on its second reading in the Commons on 14 September, to the anti-union tactics used by Spanish dictator General Franco. Corbyn also used his speech at the Trades Union Congress (TUC) in Brighton to claim the Tories were "poverty deniers".

Elsewhere, the UK's monthly unemployment numbers are due to be released at 9.30am BST. The labour market figures could give Corbyn something extra to challenge Cameron on, if the data takes a turn for the worse.

You can watch one of the most hotly-anticipated political duels of the year on BBC 2, Sky News, or Parliament TV from 12:00pm, follow all of the action live on Twitter (@IBTUKPolitics) or, if you are one of the lucky few who have bagged a free ticket, you can watch PMQs from the Stranger's Gallery above the famous green benches.