I had the alternator and battery replaced in our 2008 Holden Astra about 18 months ago. On occasions recently the battery has been dead flat and will not start. The battery light came on for several days, but would still start.
Returned to repairer who tested battery/alternator as working normally, but found the inhibitor switch for the gearbox to be faulty. When the car doesn't start it ticks, but does not kick over. Would this occur if the inhibitor switch were faulty?
A ticking noise is often a sign of a problem with the starter solenoid. If it were the neutral start/safety switch, you wouldn't hear anything because there would no power getting to the starter.