BMW 335D loss of power

[Ehackett]

Hi I was wondering if anyone has any ideas about my issue. 2011 BMW 335d, was working fine last night this morning come to open the car with my key fob no luck just set off the alarm open the car manually and there is no power whatsoever in the car (no lights on the dash or anywhere radio won't turn on etc.) put key fob in to start doesn't lock in to the slot or start. Got AA on the way now was Just looking for some pointers on where the issue could be coming from.
Thanks

[Ehackett]

Have also tried jump starting with no luck whatsoever and can't access the boot due to no power it is the coupe if that makes any difference.