Fabia 1.9SDi Electrical problems

Hi there.........my first post...!

I'm having problems with the wife's Fabia 1.9SDi (51 reg if that makes a difference..!).

The indicators, power windows and window wipers have suddenly decided to stop working. I'm no expert (that's why I'm asking on here....!), but I gather these are not directly related systems, so does anyone know of a reason why they would all fail at once? Is there some kind of relay they all go through?

I have tried the obvious, like testing and replacing the individual fuses, but it has had no effect.

Thanks ,