It's 0.1% for most uses and it's subject to very vague usage requirements they don't let you read until you sign up, as far as I can tell.

So you need to spend £15k a month to recoup your monthly fee.

Natwrst have more generous cashback for their bill payments scheme alone.

I think it's pretty clear to everyone that 1% cashback can only be offered in North America and other markets, as the interchange fees for Visa and Mastercard consumer debit cards are capped at 0.2% of the transaction value in the EU.