Curve card ( I have curve metal ) often has 5% back on IHG but is capped at £30.. Far more reliable than quidco etc ..

Only the UK version of the card has these offers and you have to save them / activate. Also remember that they are not there all the time. Once activated they have an expiry . Usually 2 months.. I seem to get a new one a week or two after the previous one expires .. I get the cashback in curve cash around 21 days after the spend..

So far it has worked 4 out of 6 times and for the one time it didn't work it was sorted out by curve support.

PS:for those who dont know curve is a card that you use as payment method after adding other cards ..One negatve is that their customer support can take a long time to respond .
The other issue is that you cannot withdraw curve cash but can spend it..