Before I start, I know what the BA brand police are like, so I know the answer even before I ask it....but..
It is lost on me why with SunAir, as BA's sole remaining european franchisee (as far as I recall?) and with the right equipment for LCY operations, as a relatively "easy" option for BA CityFlyer to either start new routes or layer capacity etc with the Do328...why has BA not explored this previously.
Admittedly, LCY-BCN on a 328 might be a stretch (can the 328JET do it, I wonder)....but Air France appears to have successfully layered their operations at LCY through use of the CityJet Avros, VLM F50s and Scot Do328s. Surely it cannot be such a significant mental leap for BA to figure out the same sort of thing, to help itself out, through use of its partners!