For your first card I wouldn’t worry about this, as you won’t be using it for actual ‘credit’.
If you buy your groceries once a month, then immediately pay it off online when you get home (and have a direct debit set up just in case you forget) then it doesn’t matter what the interest rate is, as you will never have to pay it.
Instead if you look at somewhere like topcashback.co.uk (there are referral links in Referral Wiki: Post/Find Here) you can find an easy to get one that pays you £20-30 for getting it, use it for a year to build up history, then cancel it and get a better one if you ever need actual credit.