2013 Grand National to modifications made for the previous year's race, Aintree announced that a number of further changes had been made for the 2013 National. Twelve of the 16 fences on the course were rebuilt with the timber frames within them replaced by a softer material known as "plastic birch". The fences are still covered with at least 14 inches of spruce and will remain the same height. The starting line was also moved 90 yards closer to the first fence, further away from the spectators' stands and thereby reducing slightly the overall distance. Aintree and the Professional Jockeys' Association jointly issued
Grand National on land he leased in Aintree from William Molyneux, 2nd Earl of Sefton. Lynn set out a course, built a grandstand, and Lord Sefton laid the foundation stone on 7 February 1829. There is much debate regarding the first official Grand National; most leading published historians, including John Pinfold, now prefer the idea that the first running was in 1836 and was won by The Duke. This same horse won again in 1837, while Sir William was the winner in 1838. These races have long been disregarded because of the belief that they took place at Maghull and not Aintree.