BHA

The BHA said there had been 24 13-year-old horses since 2000 who have competed in the Grand National, with no previous fatalities.

"As with all runners in the Grand National, Celebre D'Allen was provided with a thorough check by vets at the racecourse," a BHA statement read.

The BHA said it will analyse the "race and incident in detail", as well as sending the horse for a post-mortem.

The BHA has been approached for comment and asked to confirm whether it barred Mr Incredible from running.

Mr Incredible's behaviour at Kelso was referred to the BHA by the stewards, who said he was "unruly" and appeared to pull himself up after the 14th fence.