I have had my stuff done at the engine shop joined to the commodore centre in cardiff, not the commodore shop, but the commodore centre, further up mudibung road.
Cardiff Commodore Centre, im sure you can find other places around and that aswell, but we always send stuff there from my old boys workshop, dont have any problems.
I got all my machining work and stuff done there when i rebuilt my motor.
my i ask why you are boring? rebuilding and you want slightly larger capity, or are you fixing some damage or what? just curious