David Cameron, the British prime minister, is on his way to Washington, DC, to meet Barack Obama, the US president, for talks aimed at improving ties between the two countries.

The visit will mark the first time Cameron, who took office in May, meets Obama as a prime minister.

The war in Afghanistan and the timescale for foreign troop withdrawals from the country is expected to be at the centre of the UK-US discussions.

But as Al Jazeera's Alan Fisher reports from London, there are a few other delicate issues for the two leaders to talk about.