Horse: Cortaflex Mondriaan, 12 yo 17hh Dutch bay gelding by Topas

Age: 40

Championship experience: William has represented Britain on numerous Nations Cup squads, and made his international championship debut at last year’s European Championships. He was short listed for the Athens Olympics but an injury to Mondriaan ruled them out of contention.

Recent form

Cortaflex Mondriaan has hit peak form at just the right time for the World Equestrian Games after undergoing emergency colic surgery in December last year. William pulled off a historic double at the British Jumping Derby meeting to take the Hickstead Derby and the Derby Trial, before producing a solid Nations Cup performance at the Royal International to help Britain to a Samsung Super League win. Mondriaan and William have been together for many years (they were Horse & Hound Foxhunter Champions in 2001) and know each other inside out.

Major results with Cortaflex Mondriaan

  • 1st Super League Nations Cup RIHS 2006
  • 3rd King George V Gold Cup RIHS 2006
  • 1st Hickstead Derby 2006
  • 1st Hickstead Derby Trial 2006
  • 2nd Bramham 2006
  • 3rd CSI-A Eindhoven Derby 2006
  • 3rd CSIO Dublin 2005
  • 2nd in first qualifying round European Championships 2005, team 6th
  • 2nd CSI-W Mechelen grand prix 2004


William is married to top event rider Pippa. He has his own popular range of riding equipment.