I agree being able to through-ticket on BA to LCY and onward is brilliant, and I make as much use of it as I possibly can (as well as for getting into the City itself). But for a forthcoming trip (post Flybe-LGW) to the Continent booking over LCY I am forced to travel from LCY to LHR for my onward flight. That one I'm not so thrilled about. Thus, my suspicion that MAN might actually benefit from loss of the LGW route.