According to breakroom.cc, the 16-17 age group is paid £4.87-6.08 an hour. If I were you I'd look at a supermarket job. My friend worked at Waitrose when he was 17 and got paid £9.60 an hour.
Unfortunately there are no nearby Waitroses around
Ahh that's a shame. Most supermarkets pay well so it might be worth looking at Sainsbury's, Morrisons, etc. I've heard wedding venues also pay quite well and - seeing as there is a backlog of weddings and restrictions are easing - they may be looking for more staff. If you have strong grades you could also look into tutoring (I tutor a lad once a week for £20/hour). Good luck finding a job!
Don't think that's true at all - I started tutoring and teaching the piano when I was 16. If you it at a cheap rate compared to other tutors and advertise on somewhere like Nextdoor it won't be hard to find someone.