Head Gasket - Rover 45

My father has a Rover 45. There is oil in the water (ir vice cersa not sure!). Mechanic says the head gasket is gone. Its driving ok at the moment but he says it could pack it in any time!

Problem is, he doesn't do head gaskets.

Can anyone recommend a mechainc around the midlands who could do a job like this?

I'd imagine many would. It's just that it's quite a big job - your existing mechanic probably just doesn't want the hassle but loads of mechanics do this kind of job all the time.