staff travel
VS staff recieve travel concessions on BA aircraft and vice versa. In fact VS travel cheaper than BA staff on BA aircraft, (certainly was the case!)
BA state, for cabin crew, that you must be within 90 mins of the airport, so that you can carry out standby duties. However this does not read that you have to be resident within 90 minutes so BA crew will find cheap accomodation near LHR when on duty. I presume VS crew operate under similar terms.