The maximum permitted field of 40 runners ran Self_motion the last-ever of Aintree 's National Course featuring 30 fences , competing Competition for record prize money of £975,000 , making it Causation the highest-valued National Hunt race in the United Kingdom .

The maximum permitted Preventing_or_letting field of 40 runners competed for a share of the £975,000 prize fund , which made Causation the National the most valuable jump race in Europe .