BA appear to be attracting fairly large numbers of passengers to the current CE offering, with frequent reports here of flights with around a dozen rows of CE. Would it be a worth their while to change to a fixed size CE cabin with four-across seating and a little extra leg room, say something like the current WT+ seating? Decreasing the number of rows in the space would permit a little extra legroom, and possibly increased toilet and galley space. Lack of flexibility could be compensated for (and "curtain roulette" retained) by introducing an ET+ cabin with the current CE seating arrangement and possibly complimentary beverage or even meal, service.

Such a configuration could introduce real market differentiation from LC carriers, and even other legacy carriers within Europe.

And think of the opportunities for OP UPs.