Service garage reccommendation

This new-to-me 1988 K100RS is great in lots of ways, but there are a few niggles that I’d like sorted. In particular, I’d like the front brake lines bled and refilled, as they seem spongy, and I’d like the front forks checked out for the same reason. Can anyone recommend a shop where that work could be done (1) inexpensively and (2) pretty soon? I’m in Islington, but don’t mind taking the bike anywhere around London.

Thanks!