Grenville Nott (in foreground) in 1967
Grenville "Gren" Nott (September 22nd, 1915 - March 18th, 1977) was an assistant art director and art director on Thunderbirds - season 1 and 2 respectively. He was also the art director on the first feature film Thunderbirds Are Go.
Nott later worked for Gerry and Sylvia Anderson on Captain Scarlet and the Mysterons (1967-68), Joe 90 (1968-69), and The Secret Service (1969).