I use tavern service station, crosspool.
They are OK if you are nearby and on the south side
Manchester Road
Sheffield, S10 5PL
0114 266 2408
Seem reasonable for service and MOTs but I did find that they got stuck with diagnosing some problems with warning lights on my skoda recently. They don't try and fix stuff that isn't broken though so I think relatively honest.
not a glowing reference but OK overall if you are near!
good point above from Pook, I had been moaning recently about my diesel and then actually read the manual to find I should have been letting the glowplug lights go out before ignition!