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I'm assuming that you can't get into the car?
A flat battery can mean you can't get the deadlock or alarm system to release its grip
I'd start by charging the battery as you can't get into the car/boot the other way to do this is jack the car up so you can get under thefront.
Locate the startermotor and the large power cable that runs to it - connect the positive batterycharger lead to this terminal
then connect the charger negative lead to the metal of the engine block
This should complete the charging circuit and get some power into the battery allowing you into the car
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