Hi everyone, got an M reg Astra. It's cut out on me once today while driving (was idling ata set of traffic lights). then wen I got home, I decided to start the engine again. I found that turning the engine off, waiting a few seconds then turning the ignition on to just before starting the engine resulted in a series of little knocking noises. The car still starts fine, no warnings have come up on the display or computer. Anyone got any ideas what it might be? Thanks for your help!