Good to see you back Chris - I've often wondered what happened to your car - and you. I had no issues at all with my Polo/Golf radiator and overheating. The fan only ever cut in idling in traffic. My 2nd rad had an 8mm outlet at the top of the radiator (polo) whereas the first one hadn't (golf). Both were the wider core ones.
Sadly the car is no more after aquaplanning in very heavy rain