Keith B. Shackleton (born early 1929) served as Head of Merchandising for A.P. Films (later Century 21).
Shackleton met Gerry Anderson while they both served as a non-commissioned officers in the Royal Air Force during 1948. "Twelve years later, he was persuaded by the latter to join A.P. Films. Shackleton became the managing director of A.P. Films, Merchandising, Ltd.
References
Keith B. Shackleton Wikipedia(Text) CC BY-SA