I love the Capital on Tap Credit Card, especially its reward scheme.
You can sign up for a card here and you can easily get a reward of £75 when you make your first transaction https://cashback.capitalontap.com/ref...
(be sure to read the terms and conditions)
Disclaimer: I will also get a small reward for recommending you.
You will also collect reward points which you can exchange for UK gift cards of your choice including the major UK supermarkets, AibBnB, Hotels.com, and many more.