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I drive will ping you when the voltage is low - its very obvious.
Are you getting the low battery voltage alert?
What I'm getting at - are you sure the battery has drained, or it it a starter motor issue?
There is no issue I know of specific to these cars, but only a generic fault find.
Easy test is to meter the current drain, any auto electrician can do this quickly and cheaply.
Try a mobile service like the AA/RAC - you have cover?
Tech- there are heaps of stuff that run on these cars without you being present.
I would attempt the easy fix first, battery completely disconnected for an hour to eliminate possible software issue holding on the ECU power or something.
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