to update, just went to investigate.
I let it idle for a while, and it begane to get warm..ish, warmer than usual anyway, and the temp dial on the dash got to about half way, it still wasnt HOT tho like when it works properly, no where near, just pleasantly warm.
Anyway, I went for a drive and the dial went back down and the air got cooler again.
All the pipes inside the engine bay were hot tho when I checked.
So we still thinking thermostat yeh?