After the fairly recent situation where BA took CityFlyer pilots onto the bottom of the seniority list i can't see BA taking on another pilot that hasn't gone throught the full selecion procedure. most of the CityFlyer pilots were excellent, however the failure/chop rate was considerably higher that with pilots that come through selection.
I know the aptitude tests / interview / etc..do seem quite unlinked to flying jets but it seems they do seem to work.