MMmmmmm! perhaps what I should have pointed out is with the Uk system of multiple bets is you don't get to change your mind half way through the days racing hee hee! i.e. once your bet is on, that's it even if your 5 horse accumalator for $1 has achieved 20-1 x 20-1x 20-1 x 20-1, your $194,481 winnings runs on the next horse!

And if you think that it can't/won't happen, just check out Guiness book of records, horse racing, betting, you will be amazed!