The British Prime Minister David Cameron has vowed Britain will do 'everything we can' to defeat Islamic State after another British hostage was beheaded.

 

I.S. militants posted a video of Alan Henning's murder on the internet last night.

 

The 47 year old taxi driver was captured in Syria last December - he was delivering aid.

 

Mr Cameron says the killing is "abhorrent" and "unforgiveable".

 

There is now speculation over whether the UK should extend airstrikes into Syria.

Sky's Chief Political correspondent Joey Jones is in Downing Street.