2012 Olympics: Great Britain's William Fox Pitt with his horse Lionheart (love that name!)
William Fox-Pitt of Great Britain rides Cool Mountain during the dressage section of the Badminton Horse Trials on May 8, 2014 in Badminton, Gloucestershire
Horse - Dressage
William Fox-Pitt, of Great Britain, competes on Chilli Morning
2016 Summer Olympics Equestrian | William Fox-Pitt, of Great Britain, rides…
Madonna has had riding lessons with William Fox-Pitt, who won silver with the Great Britain team at the Athens Olympics in 2004
Multi Color Horses 21
William Fox-Pitt of Great Britain on Lionheart negotiates a jump
William Fox-Pitt of Great Britain acknowledges the crowed following his Dressage test aboard Lionheart during the Eventing competition at Greenwich Park.
Olympic Equestrian | London 2012
Boodle's, founded in 1762. It has been located at 28 St. James's Street since 1782. According to Wikipedia, both Fox and Wilberforce were members, but I don't think Pitt was.
William Fox-Pitt of Great Britain rides Lionheart on the final day of the Team Eventing competition at Greenwich Park.
The Olympic Games London 2012
"The Great Subscription Room at Brooks's" by Thomas Rowlandson and Augustus Pugin, 1808. Pitt was a member from the early 1780s, when Fox put him up; but after they parted company politically, I don't think he went there much.