As it transpires if you look at the label the eagle-eyed amongst us will notice the passcode is on there twice! Took me a while but I twigged this, went back to the motor and BOOM! Sorted. Pays to check!
3.0d Sport Exclusive E53 CB with black comfort, pano, folding dimming mirrors, 20"ers, comms, xenons, focal sub, Intravee II, GSM heater........and so on. Runabout - E92 3 Series Coupe