well the saga continues. pulled water pump, appeared to be ok, spins freely and no corossion, looks almost new still.
Put in gemini radiator and replaced all hoses with beeter looking ones.

Test drove, still heats up under load and above 80kmh.

Pulled thermostat, still does it.

This has got me puzzled. Will work out how to back flush engine (guess a high pressure wattercleaner into the top radiator hose wont work either... running out of options.

Ange reckons ditch the thermofan and test.im starting to think maybe there is a blockage internally some where.

Timing is still ok and no oil in the water or water in the oil.