Does anyone know of the location of a decent (or official) earthing point somewhere near the fusebox or pedals?

Thought Id found one - but it goes to +12V when ignition switched ON... D'Oh!

one on the steering column

There's a domed nut to the left of the relay plate (behind the lower dash panel).

Here's a picture

http://www.briskoda.net/forums/topic/182795-best-place-to-take-switched-live-feed-from-for-electric-seats/page__p__2197551#entry2197551

Ta! Ill go and have a look