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
Weekend newspapers printed stories suggesting the couple are planning the move.
Another warm day is forecast for much of the UK.
The study used expose-style articles to see how they would impact teenagers’ behaviour.