How to fix faulty electrics in a peugeot 206 1.1 W reg 3dr?

I bought this car last August, since I bought it one thing has gone wrong after another, my most recent being the electrics in the car..... all of this happened at once..... the interior light will only work with the key in, the hazard lights won't work, the clock resets to 1:00 every time I open then close a door (does nothing at all when a door is open it just goes blank) and the radio (which was fitted when I bought it) will only work with the key in. If anyone can gimme an idea where to start I'd be greatful, I'm an electrician so should understand what to do, just never done much on my cars in the past.