IIRC BA use "Shuttle" for domestic flights and/or positioning flights, where as "Santa" is used for the Dreamflight christmas flights and "British" is used by BA City Express.
Please correct me if Im wrong
Why do we always hear BA drivers referring to themselves as, "THE SpeedBird"?
You will find that quite a few airline drivers refer to themselves as "The XXX123". The only time I heard BA pilots make themselves sound superior was when I used to hear “XXX Tower, Speedbird CONCORDE XXX”. They added Concorde as if to say “Mine is bigger than yours”.