Problem solved!
At first I changed the thermostat, which after I bleed the cooling system all seemed well, until I took it on a long motor way run. I checked the water pump through the thermostat housing and it seemed fine. But the cooling system still seemed to under high pressure even after the engine had only been run for small periods.
So I bite the bullet and went for the head gasket. It wasn,t an easy job, even with help from friends, (I wouldn't advise you try to take the head of unless you have worked on diesal heads before,). After a week (head skimmed, pressure testing, new gaskets and oil seals) and alot of hard work the was back on the road, in full working order. Months later no problems at all.
Looking at the Gasket you would have said there was nothing wrong with it. However after the problems I've had, I would't think twice about these symptons beening caused by the head gasket.
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