Disco 4 fault

Hi guys I’m at a total loss I own a disco 4 2012 recently acquired a fault of no radio or heating, won’t lock passenger side windows won’t work , mileage and temp won’t display indicators work on outside but won’t shown on inside and I can only start by holding key under steering column to register key it does drive perfectly but when turn off it says it has every possible fault going I’ve had to 2 garages been charged a small fortune and I’m no nearer to getting fault fixed I’ve got no knowledge of the way around a car engine at all was wondering if anyone could give me some advice cheers guys

I know now't about D4s but have you checked the battery?

I own one of these delightful vehicles but they are very high maintenance and as said above the battery is the first thing I would suspect - they are very fussy about these !

Hello and welcome
get a multimeter and check voltage of battery less than 12.5v it not good
or get a drop test done