You can find everybody's B-conditions numbers if you go to the
CAA's website and look up CAP 475 (directory of approved organisations) which you can download
here (about 700 kb) where a quick search will show that G-79 belongs to McAlpine Helicopters based at Kidlington.
Last I looked, B-conditions numbers were up to about 83 (although I don't think that they get re-used), I think the most recent to receive being MANN group at Fairoaks.
If you want to know a bit more about B-conditions rules, again on the CAA's website download BCAR Section A, and the regs are all in BCAR A8-9 (pretty much essential bedtime reading for any civil flight tester !).
No idea about the specific aircraft I'm afraid, sorry.
G