It's true by disconnecting the plug in the engine bay the problems with the radio, wipers and reversing lamps have all gone away. I did for a week reconnect the plug and the issues came back, so up with the bonnet and off with the plug again.. so is it a simple swap out of the Hid module to cure this problem.. Just started to have a new problem with the radio/sat nav whereby the unit stays on but I lose the screen (goes blank) sometimes it comes back but most the time it's blank, radio works fine and volume etc, but it's a pain if you wanna change something