[1] His father was Johnny Henderson who was one of the founders of the Racecourse Holdings Trust as well as earlier in life being Aide-de-camp to Field Marshal Montgomery.

Binocular's Champion Hurdle gave Henderson a fifth win in the race, equalling the record held by Peter Easterby.

Henderson was appointed Officer of the Order of the British Empire (OBE) in the 2020 New Year Honours for services to horse racing.

[2] In June 2009, Henderson was found guilty by a British Horseracing Authority panel of breaching the rules of racing, after Moonlit Path, a mare he trains for the Queen, failed a drugs test.

He caused a little controversy when he attended Royal Ascot when the horse ran but was not breaking any rules as he had not been "warned off" and he was a guest of Barry Hills.