Perkin the Embraers you see belong to Flybe they have not had the BA paintwork removed since the Flybe takeover of BACON ,and in all probability they wont ,Flybe are free to put them on any route that they wish. The codeshare you refer to is not codesharing in the conventional sense but a stop gap measure until Flybe phase out the BA flight numbers and it becomes just Flybe BE flight numbers.