I have a Rover 214 (1998). It has had a bit of a knock but I'm not sure if this is relevant. We drove a short distance, stopped and turned the engine off. When we came back to it about ten minutes later it wouldn't start. The dashboard lights come on but the starter motor does not come on. When I turned the key there was a clicking coming from the left of the dashboard. It worked ten minutes later and again the next day but now won't work at all. It has an immobiliser but the LED that flashes to indicate that the immobiliser is on no longer lights up at all.
I have tried turning the immobiliser off using the key fob and using the back-up method involving entering the code using the key in the driver's door but neither of these have had any effect.
Do you have any advice about how I could diagnose and fix this problem?