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The battery could also be duff, and not holding much charge anymore. If the battery is original, I would suspect this to be the case on an 02 reg car.
Before you do replace the battery, it may be wise to get a load test done to see what is going on. This way you will know for sure if the battery is dead or if its being charged correctly.
Of course, saying that it could very well be down to a faulty starter motor.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo