Ladbrokes spokesman Balthazar Fabricius said: “The royal wedding being switched to Saturday could mean that we could see a huge gamble as punters won’t fail to spot the link.
“If Camilla joins the royal clan and Clan Royal wins the National, we’ll be forced to pay out a king’s ransom that will cost us millions.
“We expect the royal wedding to heighten interest in the National, with over £250 million expected to change hands on the race.”
Meanwhile conditions at Aintree improved today ahead of Saturday’s race with the ground on the big-race course drying out slightly.
There was hardly any rain at the Merseyside track last night and it has been dry yesterday.
Clerk of the course Andrew Tulloch described the Aintree turf as “in top order” and changed the official going on the National course to good to soft, good in places.
He walked the course with Jockey Club inspectors, the former jockeys Ron Barry and Peter Hobbs.
Said Tulloch: “The forecast for the week is showers with spells of sunshine, with the possibility of longer periods of rain on Tuesday and early Wednesday.”
The Met Office forecast is for dry and sunny weather for Thursday and Friday.