Don't waste your time on conspiracy theories, whatever bizarre story M G tries to spin in ABTN!!
BA had a pair of slots going spare due to an under-performing LGW-GLA rotation, and for whatever reason somebody at BA HQ thought a service to NQY would be a bright thing to do. End of story.
BA will lose a pile of money, BA will lose (have lost?) the ASW handling contract at LGW, giving another handling agent their long-awaited chance to get into handling domestics in North Terminal, and BA's name generally mud in the South West having previously dumped their services and now coming back to take on the regional carrier they encouraged to set up in the first place.
So everybody loses apart from (a) ASW who will have a long and successful future at NQY due to their local market loyalty/local marketing presence and rock-bottom cost base and (b) A.N.Other handling agent who gets a foothold in domestic handling in North Terminal.
Well, that's my humble opinion anyway!