I get 1% cashback on credit card spends - no point in telling you which card, because that offer is no longer offered to new applicants.
I have 'R points' and 'I points'(if I order groceries via MySupermarket.com)
It takes a long time to gather those points so I have not bothered with them much lately.
I rely on free delivery from Adsa using an Asda credit card, and my 1% cashback card for everything else.
When I need to replace a household item I use this site
Offer of the Day [Offeroftheday] - All the sale & clearance items from major UK retailers
which might well provide me with item cheaper than using Quidco