WARNING....they never ever pay out !!!!
Have used this site a few times, and every time the cash-back gets refused, I put in a claim and months after I actually booked the cover, they come back and say the claim has been turned down. It's not really about the money...the cashback amount is usually a pound or two, but it's the principle....if you don't want to pay the cashback, don't list it. They would still probably pick up business based on their pricing, but they won't get anymore from me.