trainer Aiden O'Brien hints at using horses once more this season . O'Brien 's filly Joseph raced at stud but struggles to make money . Hennessy Gold stakes winner Many Clouds will be ridden by Leighton Aspell at next week 's Grand National .
Trainer Aiden O'Brien hints at using Ryan Moore more this season . O'Brien 's son Joseph raced at Limerick but struggles to make weight . Hennessy Gold Cup winner Many Clouds will be ridden by Leighton Aspell at next week 's Grand National .