There's not one ready calibrated for the UK as far as I know, but you can calibrate the maps yourself (all explained in the readme), although I haven't tried this yet.
I tried the program out last night, taking off from Miami Intl. found the amount of info on the maps quite amusing, I mean, it tells you where the golf courses are, also passed a College (which looks like a regular house in FS

), a couple of stadia and finally landed on Palm Beach.
Not much of a flight, but worth it to try this tool out

I noticed a small drop in FPS (like maybe 1 or 2), which isn't too bad considering it's constantly rendering as you move

I don't think I'll use it too much, I only get 10-15 FPS at the best of times


Although, all things being equal, it's not a bad little add-on/in
Cheers,
Carl