In a two-part Come Dine with Me special for Grand National week, four well-known faces from the world of horse racing go flat out to win a £1000 for charity. First to host is professional jump jockey and Hennessy Gold Cup winner Mattie Batchelor, who's out to prove that jockeys don't just eat lettuce. Night two sees racehorse owner and former Wall Street banker Sally Rowley-Williams host an evening in tribute to past National winners. Joining them for a week of dinner parties are professional footballer turned racehorse trainer Mick Quinn and Channel 4 Racing presenter Emma Spencer.