Thanks for that Phil, I'll try the fuse.
Yeah I've heard, read and experienced that they're not designed brilliantly. I had the entire drivers side one replaced a few months back as it didn't retract properly. Thankfully I got it done under warranty from the garage I bought it from so didn't cost me anything.
CURRENT: 2008 E90 M3 DCT - Jerez Metallic Black
PREVIOUS: 2006 E90 325i SE - Titanium Silver - Manual