Driving home, all of a sudden radio goes off, airbag light comes on and battery light comes on under breaking, goes off when not braking. Went over a speed bump ten minutes later, problem solved, radio back on and lights off. Clearly a faulty electirical connection.

Any ideas where ?

does it have abs???

Give the fusebox and it's relays and connections a wiggle or a whack to see if the problem comes and goes! That's the most likely area for electrical faults on Favorit's and Felicia's in my experience.