Thanks for the info, I have contacted the dealership regarding the firmware and the salesman said he would check regarding the this as he did not have a clue to what I was talking about.
I would still like to update the software as a nav system with no postcode is of no use as far as I am concerned. I have used a small mio digiwalker with tomtom installed for about 5 years and most times it has done what it was supposed to do however it would be a shame to have to use that instead of the BMW inbuilt system.
So could anyone please let me know which version would have postcode included,thanks.