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Hi Nicky and welcome to the forums.
Sounds to me like one of the microswitches has gone open contact or something causing it to be sending a signal all the time.... hence draining the battery. Thats my thinking on this one anyway.
Have you noticed if the car locks / unlocks when you stand near it with you actually pressing any buttons on the keycard.
Give Gary a bell from the following website and he may well be able to advise further a fix the issue for you if its a problem with a microswitch.
A lot of our members have used him and he provides a first rate service. You will need to send the keycard away to him for a few days though.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo