Blowers, heaters, air con, trip computer, steering control buttons not working, also radio doesn't turn on with ignition any more and switches itself off automatically when turned on manually after half hour or so.

The trip computer, steering wheel control buttons, aircon, heater, demisters /blowers have all stopped working. The windows mist up and I can't clear them as wiping them doesn't work.
Also the stereo used to come on and off with ignition but now doesn't and the radio turns itself off after about half an hour when turned on manually.
It flew through the service and MOT two months ago.
70,000miles on a 2012 plate. It's been fine until now.
Taken to vauxhall dealership who seemed more concerned she was out of warenty.
I love this car and don't want to get rid of her but need someone to give me a clue as to what's wrong with her. Any ideas?
Would a battery that's not fully charging have anything to do with it? Asking as this seems to be vauxhalls answer amongst others.
Thank you, I don't know much about cars, clearly.
I use this car daily for school runs and getting myself to and from work.