Would you cash out or let it roll ?

One Betfair punter stands to win £511,225 for a £5 accumulator bet should his last selection and hot favourite, Envoi Allen, win the opening Marsh Novices’ Chase at the Cheltenham Festival on Thursday.

Betfair spokesman Barry Orr said: “The customer is sitting on over half-a-million pound payout for just a £5 bet and told me he won’t be able to sleep tonight. I’d say that’s a massive understatement.

“He could take the cash out offer of £275,000 and sit back safe in the knowledge that regardless of what happens in the race he is £275,000 better off, or he can reject the offer and hope that Envoi Allen beats his seven opponents and also safely negotiates the 16 fences to land his incredible bet.

“Envoi Allen is 4/9 favourite, so he may well stick and let the bet run.”