For the record & just saying....The w/end Embraer operation @ STN along with some other airports IS British Airways/BAW & the services (of which there were/are 9 destinations this year @ STN for a total of 15 departures per w/end) are operated by BACF who obviously have spare capacity available during LCY`s w/end curfew & also exploiting perceived potential/gaps.
So effectively a win win for both units..Whether it is a permanent model I think no one has ever concluded in the forums..The only permanence & influence I guess being LCY`s obligatory curfew.