All I can do is laff at myself. I had much the same issues, pressurisation, and overheating...
Pulled my head off (my mum keeps saying i would lose it if it werent firmly attached) and the head gasket is absolutely mint...
No damage to it anywhere to be found.
So now I'm at a loss, I've replaced all the water lines, the water pump, and its had a good flush... Failing replacing the radiator and the thermostat (again) I'm at a loss...
Now my starlet sits in my shed, alone and headless XD. (I will put it back on, I promise!) But before I do, with so much of the engine out of the way imma try to find the oil leak that has been plaguing the wee beasty since i bought it a couple of years back
.