Got Astra 1800 16 v Auto W reg that has infrequently objected to start. Realised that all occasions were after very short preceeding journeys. Need to keep foot down on accelarator whilst turning over for a few seconds until it fires up and settles to normal smooth running. I'm guessing the ECU needs a minute or two to reset itself for the next start so avoid short journeys such as just moving the car to re-park. Irritating but resolvable without more expense than battery stressing.