The Queen's horse Carlton House set to race at Epsom Derby
3 June 2011 Last updated at 08:30 BST
The Queen could be in with a chance of winning the Epsom Derby for the first time as her horse Carlton House is tipped as a favourite.
There had been doubts about the participation of Carlton House after he developed swelling in his leg earlier in the week.
The BBC's Mike Bushall gets a tour of the Epsom grounds.