This may be of interest to some.
The PP to win any race market allows you to put your horse in a multiple, providing the horse(s) you are putting it in with are from a different market. For example, I've just doubled Red Jack TWAR 16/1, with Buveur D'air in Champion Hurdle.
Most firms don't allow this as they are usually special markets and restricted as singles only.
Well that is a game changer. I know exactly how I am spending 'work' today