Coral have an offer where you will receive a monthly payment into your Coral account (that can be withdrawn) giving you 10% of your losing bets back. As cash. Their website says:
"We recognise that not every bet is a winner one. That's why we're launching our biggest Cashback giveaway offering all coral.co.uk customers 10% back on any sports and gaming bet losses.
This fantastic offer represents genuine value and is available to both new and existing customers!
You can qualify for this great Cashback offer by registering to coral.co.uk, new customers will need to sign up for an account first.
Once registered, you'll will automatically receive 10% Cashback of your monthly aggregate losses, paid into your coral.co.uk account."
This offer will run for the rest of the year.