Hi all, thanks for all your advice, just to let you know that I have resolved the problem and to post the resolution in case anyone else has the same issue.
On the 8100 I had created a group called 'Family' and it was this that the BMW did not like. As soon as i removed this groiup, it synced all the addresses beautifully.
One other question - in the US is there a plug in cradle for the 8100 - there isn't one in the UK and I just wondered if there was one in the US.
Thanks once again for all your suggestion - most welcome
E93, Black Sapphire with Cream Leather and Aluminium Trim | Automatic | Pro SatNav | Logic 7 | Bluetooth | Heated Seats with Lumbar support | Comfort Access | Climate Screen | PDC | Adaptive Headlights | Rain Sensor & Auto Light | High Beam Assist |Voice Control | USB Audio | 8Jx17 | Storage | Through Load