Over the years, he has invested heavily in both racing and breeding and has acquired major operations in England, Ireland and the United States.

The other two are Derrinstown Stud near Maynooth, County Kildare, Ireland, and the 3,200 acre Shadwell Farm near Lexington, Kentucky, United States.

Shadwell's most famous broodmare is Height of Fashion who was sold by Queen Elizabeth II to Sheikh Hamdan Al-Maktoum after setting a new course record in the Princess of Wales' Stakes.

In England he currently has approximately 200 horses in training spread over a number of trainers including Michael Stoute, Owen Burrows, John Gosden, William Haggas, Marcus Tregoning, Ed Dunlop and Mark Johnston.

In the past he sent horses with great success to Dick Hern, Michael Jarvis, Barry Hills, Alec Stewart, John Dunlop and Harry Thomson Jones.

In late 2005, his Shadwell Stable acquired the Argentina-bred and Uruguay-owned racehorse Invasor and brought him to race in the United States.

He won them the Dubai World Cup but was retired in June 2007 following a non-life-threatening training injury and now stands as a stallion at Shadwell Farm in Kentucky.

Shadwell Stables won the Eclipse Award for Outstanding Owner of 2007 thanks to the efforts of Invasor and leading filly Lahudood.