After waiting what seems an age on the question I put to my BMW dealer.
"Can the yellow bulb that light the daytime daytime lights or Halo rings be swapped for the white bulb thats in the new 3 series, 5 series GT and facelift X5 for that OEM look?"
The dealer told me that the bulbs are identical and it is the rings that are coloured?!?!?
I don't know where to go with this now, can anybody help or can they check with their dealer?