Its worth dropping that TRL bloke an e-mail mate.
He works at Heathrow BMW so should be able to get you an x-drive version of whatever you're after although it'll obviously up the monthly price.
We got my wifes BMW from the local dealership which was 6 months old (come from someone from BMW head office?) and spec'd with absolutely everything however we pay quite a lot more than what TRL has quoted for a brand new similar car...unfortunately I was a few months too late finding out about his offers!!
I will do, Thanks