Hi Matt
Well someone has fitted one of those old Nokia 6610 cradle things with a speaker attached to the sun visor so you could be on to something there. Incidentally today I tried the air con and nothing, it wouldn't engage and the air con light was flashing, so I had it topped up and still flashing, they checked for leaks, and there were no leaks. The air pump looks new so I'm going to check the fuse or relay. But where is the relay for air con? I've checked the engine bay and nothing in there that says air con o it, unless it's got something else written on it