Thanks for reply Kev t. The rad was blocked up with dust, I blew it out with an air line and replaced the water pump as this was on its way out. However i'm still having issues with the overheating but not as often now. The gearbox was covered with about 2" of dust i have cleaned the dust of, i'm guessing that could of been a major factor in the overheating as the radiator has oil cooling built into it. the fan belt is at the correct tension, head gasket looks fine but am going to do a compression test next just to eliminate that but i can't see any tell tale signs of the gasket failing?
regards suchy1977