William Hills have a horse called Dogon at 50/1 for the 450. I've lumped on - he's 17s on the exchange.
What happens if it's a winner, do Hills have to honour it if they've accepted the bet?
If it's a 'palpable error' which it sounds like, then no, unfortunately no......
it clearly wasn't. Pulled up in the at the start of the run in. WH opened the price at 66 and brought it in to 50's. The only error here was on the exchanges.