The Gatwick's ran with a Gen van converted from a Mk2B BFK, 8911.. But the lads won't be producing that one, I would imagine as it doesn't really fit with the other Mk2Bs being released here..
Or maybe its the ace up their sleeve for a Christmas surprise release
Also, to add in as I don't see it mentioned yet, the NIR MK2B would have occasionally went further afield on the IE network on GAA specials, and I think they even ran to/from Dun Laoghaire for a short while to offer a ferry service connection..