Originally Posted by
KenJohn
BAA do not, as far as I a aware, have anything to do with immigration staffing levels
Correct, they have no control over UKBA's procedures or operating strategy (including staffing). It's a source of much frustration at BAA I believe.
BAA are responsible for the immigration hall infrastructure (desks, lanes etc.), but UKBA are responsible for using them properly and for providing their own equipment and staff.