I left the last entry saying the engine would get hot but not the radiator, probably due to a stuck thermostat.
Well I have now cured that with the radiator getting warm to hot and the top hose likewise so the thermostat is opening. What is happening now though is alot of white smoke from the exhaust and the coolant level dropping regularly.
This is at a steady 900 RPM. Also the oil looks very light in colour but I can't actually see any "mayonnaise" but I suspect head gasket failure.
This would be from either us driving the car in the Czech Republic for a few miles after the wild boar collision with low/no water when it got very hot or from me running it recently when I couldn't get water to flow around the system properly (see last entry).
It's probably a combination of the two and I fear a replacement head gasket along with maybe a skim of the cylinder head.