Hi I have a Disco 2 TD5 which sounds to me like it has a sticky starter solenoid. It sounds like it's going to start but instead of the motor turning over it goes click and noting happens. If I try for 10-15 attempts it turns over an fires with no problem. Am I as well to buy a new starter motor since if the solenoid is corroded and sticking then at 120,000 and 10 years the starter is probably in a similar state. I'm not the most competent mechanic and would like some advice to prevent being royaly ripped off at a garage.