OK just to close this topic, there are currently two types of airbag wiring looms for the MK6 Golf GTI MFSW:
5K0971584A for the early ones, with the standard puprle airbag connector, three earths and a circular horn rail connector
3C8971584A for the later ones, with a later Blue airbag plug, one earth and a spade horn connector.
Cheers