A revised filmography below:
It was J. Crewdson Jnr - known as Johnny... and it is Ackroyd (I think)..
G-FILM appeared in at least one episode of
The Professionals as did both G-BGGX & G-BGGY.
G-FILM also starred in a Schweppes commercial shot on Chobham Common.
Several more, but can't remember the details..