The past few months have been far from easy for Tony Blair , but on 6 May he faces a new challenge - his 50th birthday. John Seargent presents a light-hearted tribute to the prime minister, interviewing political peers - including Bill Clinton , who also turned 50 while in office - and enlisting the help of friends, colleagues and some surprise guests in planning a perfect 50th birthday party for the prime minister. Producer Charles Bruce ; Executive producer Fiona Stourton