Following the earlier substitution of a B777-300ER for an A380 on the BA25/BA26 London Heathrow – Hong Kong rotation, British Airways Boeing 777-336ER G-STBG operated the BA27/BA28 London Heathrow – Hong Kong rotation tonight in place of the usual Boeing 777-200ER in order to match as closely as possible the capacity of the scheduled A380 and B777-200ER on these flights.