Iain,
I have just been able to take a look. Unfortunately I don't have an extension bar of the right length to get the lower solenoid bolt out and the vac pipes won't move at the angle they are at, so I haven't been able to actually clean the solenoid yet. However, connecting the green connectors only operated the fans, the solenoid didn't click and I couldn't feel any mechanical movement. I then got my nine year old daughter to rev the car to 5k whilst I watched the turbo actuator bar - there was no movement. To me this suggests the solenoid simply isn't working, would you agree?
Regards,
Mark