The Belslow civil registration/certification was carried extensively years ago in Flight International.
It seems (as I recall) that the type required a stick pusher by the UKCAA, but in order to get the type into service sooner, another crew member was carried.
His sole duty was to keep an eye on the indicated airspeed, and if it got too low, he was to shout 'STALL, STALL'.
Strange, but true.
