Blimey! I'm getting ripped-off! To remove a tyre, then replace the same tyre and re-balance the wheel, I don't think I'd get away with paying less than £20 anywhere.
Actually, funny you should mention that! I have just this minute got back from collecting a tyre that they've repaired a puncture in! It came to £19.40. That was dropping the rim off to them and collecting it later, because I had a meeting this afternoon, so I couldn't wait, and it was completely flat, so I couldn't be fagged, putting the space-saver on, to drive it there. Maybe they'd have wanted more than £20 if it had included removing and re-fitting the rim?
So maybe £20 was a bit O.T.T, although in the OP's case, he'd want them to take it off the rim, then he'd want to take the tyre and rim away, and bring them back when he'd finished fettling his rim. That's what living in a rural area does. No competition, see! If I were to drive into Whitehaven or Workington, it would cost me the best part of a fiver in fuel anyway.
Blimey! I'm getting ripped-off! To remove a tyre, then replace the same tyre and re-balance the wheel, I don't think I'd get away with paying less than £20 anywhere.