 It was after this that bookmaker Ladbrokes made an offer, signing an agreement with Davies allowing them to manage the Grand National.During this period, Red Rum was breaking all records to become the most successful racehorse in Grand National history.Originally bought as a yearling in 1966 for 400 guineas (£420), he passed through various training yards before being bought for 6,000 guineas (£6,300) by Ginger McCain on behalf of Noel le Mare.