This company charged me around £300 to have the head gasket done on my 2003 Astra 1.6 it was in the garage for 3 days when I got the car back it still had the same problem, they did not even change the oil and filter as they said they would, they broke one of the brand new ht leads as well and replaced it with an old 1.
It turned out that the catalyst needed to be replaced and not the head gasket.
So since then the car burns oil like its going out of fasion, misfires when warm, and never idles steady.
I have been in the trade since leaving school and really wish I had done the job myself, I really do not think any of the people there are qualified or even have any knowledge of what they are doing.
I did complain to the owner but he just was not bothered
DO NOT USE THIS PLACE