How much should I expect to pay for a manual m3 coupe? (UK)

I’m looking to buy a manual m3 coupe in the near future, and the market (at least for the UK) seems a bit all over the place and it’s hard to tell what’s a good deal and what’s not. What should I be looking to pay for something that’s not mint, just a car that’s not been too abused (for an m3 🤣). I wouldn’t mind high miles as long as the service history is good.