builder of the K9 prop

TV Watching Edge of Darkness for the first time this morning, who should I spot escorting a radioactive corpse to the banks of a lake?



It's Mat Irvine, the BBC's visual effects wizard and builder of the K9 prop on Doctor Who.  It's 1985 and this was one of the many shows he would have worked on in that capacity, which also included The Tripods, Blakes-7, Rentaghost, Terry and June and To The Manor Born [source].  I wonder why he stepped in front of the camera here.