Sweety
Project 'SOLAR' (not SOLO) is the normal two yearly review of the Gatwick Business plan. BALPA are well aware of it and have a voice on the panel. I suspect BASSA refused to have anything to do with it and are just using it as a scare tactic, hence the hushed whispers you've heard about it.
Funnily enough, their current thinking will actually increase the amount of flying out of Gatwick, although nothing is firm yet.
Another example of BASSA mistruths and scaremongering.
LD