Three months ago some of Britain's best loved artists agreed to take on the challenge of producing portraits of today's sporting heroes, including Zara Phillips, Ricky Hatton and Didier Drogba. Their goal was to raise as much money as possible for Sport Relief when the works of art go under the hammer at auction. Here, the sittings get under way as Zara Phillips meets Jack Vettriano and Rankin, and Ricky Hatton heads to a boxing ring to meet Peter Blake and Gerald Scarfe.