TeeS: My HEMS exemption, issued by CAA, applies "when engaged in HEMS" as defined in JAROPS 3.
That JAROPS definition makes no mention of "proceeding directly to the scene of an accident" or" response to a location" as mentioned by you and Zaplead. Your JAROPS purpose is to "facilitate emergency medical assistance, where immediate and rapid transportation is essential" So nothing to stop you landing by that ambulance in the large factory site. The HEMS definition is quite clear.
However, to satisfy the CAA exemption requirement "life is perceived as being lost" still applies if you cannot acheive Group A performance during landing or takeoff.
So how do the air medics apply that rule? Fractured wrist? perhaps not. Tib and fib? maybe. Femur, possibly? 80 yr old hypothermic? Suspected(but not confirmed)broken neck? Not clear at all!!
TC has got it right. Damned anyway!