I used SPR Autos in Stockport who are a proper old fashioned fix-it garage. Charged £205 for an 'F' service on my car. Plus I've had disks, pads, front suspension arms amongst other things. I was impressed with the service & speed, the mechanic who was working on the car was enthusiastic & knowledgeable.
From another thread:
SPR AUTOS
Merc-Benz Specialist
Unit 16
East Portwood Trading Estate
Offerton Street
Carrington Road
Stockport
SK1 2JT
0161 480 6095