OK, so I got the heater going and then the radio packed in. This is a 2000 W reg Fiesta with a ford traffic 3000 radio cassette. Works fine except the volume button has stopped working ie, the volume is on but I can't turn it up or down. The volume button also works the bass/treble and the balance and none of these work either. Please help, I can't hear the radio above 20 mph.
Thanks to JK for the heater tip, it works fine now after fitting the new valve.