At the age of forty-seven Mary King won a Team Bronze at the Beijing Olympics. In the two 'Cavaliers' - 'Call Again Cavalier' and 'Imperial Cavalier' - she has two of the very best event horses in the world.

Mary King's success in the world of eventing (now officially classed as the most dangerous sport in the world) has been hard won. She does not come from a privileged background - her father a verger and a long-term invalid so money was very...