I've been looking at this for a while now as well but I wonder how it goes with the usual advice of not paying anything up front? From what I can tell, you don't pay the £56K in one go, you pay £XX at this stage, then £YY at the next stage, then £ZZ later, so it's still modular but I'm not sure if you pay Wings or if you pay whatever school you're in? I think it was £10K-12K for the first part which was PPL, but then people have always said never to pay for anything in advance, not even paying for a 10-hour block time if you were hour building!
I think it's the same with the Big 3 in such that you pay £XX then £YY then £ZZ so they're not different there but the Big 3 is integrated course and they're the "Big 3" for a reason whereas Wings is just a group of flight schools and is a modular course. I'm guessing Wings Alliance can disappear and the participating flight schools can still remain but with no obligation to honor payments made to Wings?