MAN-LGW is a dead duck, just like STN-NCL. There's not enough p2p to make it work and there's just no alliance or network operation in place at LGW. EZY don't do connections and BA's business model is now p2p loco leisure on short haul, not something people connect for when they can fly MAN direct. The clue in this market is that not one single operator picked it up when BA walked away.
Time to move on. Btw LGW at peak time had world class enormous queues in summer.