Thanks Darrsi
I’ll do the rad flush thing the coolant that came out was a bit minging.
Empty what's in the system, PUT COOLANT BOLT BACK IN LOWER DOWN, empty the whole bottle of Radflush in, then fill up to the top with water. Then it's up to you, you can either go for a 5 or 10 mile ride in this cooler weather, or you can simply put the bike on the centre stand and let the bike tick over for 10 to 15 minutes.
Letting it tick over might even get the fan to eventually turn on.
Once you're done, flush everything out with a hose, then slowly fill the system up with the proper coolant mix trying to avoid glugging it in creating trapped air.
What i normally do is then let the bike tick over, even VERY GENTLY using a bit of throttle, with the thermostat cap off to let any air bubbles escape which will rise out to the top as the coolant cycles around the engine.
Then switch off, fill coolant right to the top, cap back on, and your system will be good for quite a while.
Just a note for anyone else reading this, this much cooler weather is ideal for doing the Radflush treatment because you don't want the bike overheating when there's mainly just water in the system, because the engine will boil plain water just like a kettle if it's already hot outside.