The nun, the artist and the skewbald mare

The partnership of John Whitaker and Milton back in the 1980s was the stuff of dreams. The Pegasus-like grey became the first showjumper to win more than £1m in prize-money, but, as revealed in this extract from John’s new book, John Whitaker — The Legend, there was one dark cloud — the unbeatable duo would never contest an Olympic Games