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The FBI has released photos of two suspects it wants to identify as part of the investigation into Monday's Boston Marathon bombings.

Sir Chris Hoy has announced he's retiring from competitive cycling, ending the most successful Olympic career of any British athlete. Tony asks if you're so driven to win, how do you cope with the change to normal non-competitive life? Chris Evans, Gary Barlow, James May and Professor Brian Cox are in a pink Rolls Royce, driving to John O'Groats for charity and they speak to us live on the show.