PROBLEM SOLVED Firstly, thanks to the people who offered advice for this problem especially (again) Breezy Pete. The post is a bit old now but I think it's best to inform others of the solution...... The non running fans were caused by the failure of the air con. I mulled over this problem and after Breezy Pete's suggestion started checking out the air con and yes there was no pressure whatsoever in the air con system. This of course led to the inevitable replacement of the condenser. I have now completed this task but what a pain in the neck this job really, really was. Every single torx and multi spline bolt fought me every step of the way (2005, so 21 yrs old etc.). It made what should have been a reasonable simple job into the most frustrating and annoying job on a car I can remember..... If I ever meet the guy who invented torx, xzn fixings.....well, I hope I don't....loool. So, condenser replaced (eventually), the air con system re-gassed and magically the cooling fans are now both operating so it was nothing to do with the fan controller module.. I have still yet to see the engine cooling fan operate on its own but I've come to the conclusion that the engine just doesn't heat enough to trip the fan (the coolant radiator is reasonably recent) but I've noticed already that driving around with the air con operating the engine temp just takes that little bit longer to reach normal operating temperature obviously the fans are now operating. So, once again thanks to all who read and offered solutions and I hope my experience helps others. Regards Tom