I've just been for a drive and my brake lights are on permanently but only if my head lights are on. And my headlights (and tail lights) turn on when I brake. If I brake whilst my headlights are switched on the brake lights get a little brighter.

I'm baffled, anyone had anything like that before?

Any ideas what it could be? I swapped a brake bulb earlier but removing it does nothing.

Sounds like an earth issue, but that's no real help... sorry!