Some kind soul mentioned QuidCo a while back.
Tried it today with Screwfix. I did get a 10% coupon, but I'm not sure the QuidCo tracking (for 6% extra cashback) worked.
Having read their FAQ, it looks hideously flakey and easily defeated by the same technology firefox uses to reduce pop ups, XSS attacks and all the other nasties.
I'm not *that* bothered (it was the 10% coupon code I was after) but when would I know if QuidCo had worked - nothing showing in my account yet, not even a hint of a transaction...
Cheers
Tim