I took off the cylinder head, water pump and rear core plug, this gace access to all the water ways. Poking a copper wire through from the water pump I was able to clear out the waterways behind the cylinders, number two was blocked. I then cleaned out the back of the block via the core plub. Replaced everything and the engibne now runs OK. - Problem solved.
Another solution suggested to me was to put a Calgon Tablet in the engine, run it for a few days, then flush the engine out. I haven't tried this myself yet/
I hope this tip helps others who are experiencing similar problems.