Tony McCoy, who secured his second Gold Cup victory after Mr Mulligan took the title in 1997, said: "He's an amazing horse and it was an amazing performance. I'm so pleased to win it for JP as he's been so good to me.
"Jonjo has done an incredible job. I've got a Grand National and a Gold Cup out of the man and I love him to bits."
More top news
Senior medical staff have urged junior doctors and the Government to break the deadlock over the medics' long-running contract dispute.
A young girl has become an internet sensation after pictures emerged of her being attacked by a goose.
A professional mixed martial arts fighter has died after being involved in a hit-and-run incident in Florida.