Thanks Craig, nicely explained!
I do remember a call to security asking for access through Gate P9 at around the time of shut-down of NCH. Gate P9 just happens to grant speedy access to said establishment.
On another note, Agusta 139
VH-SYV made an appearance to the Air Ambo hangar last night and is undergoing some maintenance. It is due to leave sometime this morning if all goes well.