Thanks Jochen. I've checked all the fuses and all are fine. I'll disconnect the battery for a while and see if that helps. Is the a special procedure for powering down the MKIV computer prior to disconnecting the battery?
If that fails, I'll try the hidden menu options for the OBC to see if there's anything in there that's off. If that doesn't work, I'll get the dealer to diagnose. Not sure I would be comfortable enough making all the cables required for an IBUS connector. It may well be the stalk needs replacing.
Cheers
D