I’m working my way through different ones at the moment. Not many so far

• Lonton Coffee (https://lonton.co.uk/)
• Union (https://unionroasted.com/)
• Method (https://methodroastery.com/)

I need to pick the next batch soon.

I’ve also found a good way to find them locally is just to open up google maps and type “coffee roasters” and surprise myself with how many there are nearby.