Spot on! Yes, Jay Aston was in the original Bucks Fizz line up, prompted the split when she left, and is now in the Original Buck's Fizz, while Buck's Fizz is touring separately, with only one of the original line up.
GLJ was started by, inter alia, brothers Michael and Jay Aston (different one!). After some acrimonious splits, there are now two versions of the band touring.
Incidentally, the most versions of a band concurrent I know of is Sweet, with three*. Does anyone know of any bands with four competing versions (or even other triples)?**
* Brian Connolly's Sweet, Steve Priest's Sweet and Andy Scott's Sweet. The latter two are extant, but tour different areas (Steve US & Andy Europe/Aus)
** Not formally a question on this thread, but an idle query from me.