Casualty: Once in a Lifetime

A mountain-bike race between a man and his stepson ends in disaster when both riders lose control - and as the medics examine the boy, they discover old injuries that suggest he might be a victim of abuse. Dixie and Jeff try to extract a man who has got himself stuck in the mudflats by a river, and soon discover he has further problems. Jamie takes the plunge and decides to follow Ramin to Australia, but Robyn and Jeff try to persuade him to stay. Christopher Timothy guest stars