Nick Middleton in foreground (to his left in the blue shirt is Derek Meddings)
Nick Middleton (February 25th, 1935 - August 18th, 1996) was a special effects technician. He worked in this capacity, albeit uncredited, on Thunderbirds (season 1 at least). His other work within the film industry included Dragonslayer (1981), Das Boot (1985-87), Body & Soul (1993), and Space Truckers (1996).
Middleton was killed after an explosion had gone wrong on a film he was working on. He was 61.
Nick Middleton (centre in background) standing behind Derek Meddings (who is in centre foreground) on the set of Brink of Disaster