Racing broadcaster Clare Balding was among those to congratulate AP McCoy on riding his 4,000th winner, calling the jockey's feat "incredible":
Everyone there to witness it who should be - Jonjo, JP McManus, all his family and Uncle Toby, who was his first GB boss #mccoy4000
More top news
David Cameron is facing growing pressure for the UK to take in more of the many thousands of migrants fleeing to Europe.
China has put on its biggest display of military might in a parade to commemorate victory over Japan in World War Two.
Hungarian Prime Minister Viktor Orban is to meet with European Union leaders in Brussels today to discuss the migration crisis.