These bets of £10,000 with the bookmakers

Believe me,you don't

you no when these bets have been laid/taken liquidty on betfair goes up by roughly same amount

As John Banks said . You should not worry when a bookie refuses your bet ,you should worry when he accepts it.

It's worse when they say "do you want some more on?"

we worked up nigg bay 40 yrs ago ,decent money 2 lads had 2.5 grand between them on GORYTUS, 10 to 50 grand isn't even pin money to todays Uber rich, wont even notice it missing from the account

Git some footsoldiers like the pros all do

That ship sailed years ago freddie