DJV

Hello all, Hopefully i know the answer already and i'm going to test it in the morning, but very open to other suggestions too. All the electrics in the car are working fine as are external lights etc, although i noticed the buzzer for exiting the car with lights on isn't working all of a sudden? As the starter motor isn't even attempting to turn over I'm going to assume i have Battery issues and i'll charge it over night and test it in the morning. However does anyone have any other ideas, just in case? all the warning lights illuminate correctly when attempting to start the car, and i'm aware that there is sometimes an issue with the immobiliser but not had that issue to date? it has been stood for a week and it had been cold and icy where i live but that's all gone now.. so as i say assume its that. but just in case, has anyone any other ideas? Thanks in anticipation