I realised the only way really to get the fan on was to take the radiator off again - ho hum. Well with it off at least it was easy to fit the fan.
Then a case of fitting the radiator again, attaching the wiring and filling the system up with water. I always use water first until I am sure everything is as it should be and then I drain and refill with a water/antifreeze mix.
This time one of the hose clips didn't want to play ball so I replaced that.
After this though running the car got the engine hot but the radiator not at all although there was plenty of pressure when I took the cap off.
I reckon the thermostat is stuck or there's an airlock but that was enough for today. I put all the tools away and lowered the car back down onto it's tyres again for the first time in weeks.