Well today I pulled all the hose back off, checked them, put the hose through the lot, tested the thermostat opens at 85 not 81, fully open at 94deg c, so put it back together, left the heater hose loose filled it up( to bleed some air), ran it for 5 mins all ok. Turned it off ran for 5 mins again checked temp. It takes about 20mins at idle for the bottom of the radiator to get hot. Maybe to get thermostat to open all the way. It didn't boil but water temp at top of rad gets to 95 before fan cuts in. Put the coolant in and went for a drive all seems Ok. So maybe it just had a gut full of air. Bitch of a thing!!!!!!!!!!!!