Magnolia, I always clear my balance to zero every month, so I guess they charge me £3 as I'm a low-risk customer and they don't make money off me otherwise?
I think they charge you that because they are a **** credit card company?
Change provider unless they give you some benefits that others don't.
But you're right about supermarket shops. I can normally reset my credit card back to 0 every month but I'll have to be more careful this year as I'm about £150 per month worse off than last tax year.