The World Tonight

A plan to release documents about Lord Mandelson's appointment as US ambassador is approved, after anger from Labour MPs forced the government into a climbdown. We'll ask how much danger the Prime Minister is in and speak to the head of the parliamentary committee that will determine which documents - related to the appointment - will be released.Also on the programme: As a US-Russia nuclear treaty expires, can we expect another arms race? And humour from a Briton who suffered terrible injuries after a shark attack in the Caribbean.