Uncle Mac's Jig-Saw Puzzles

Uncle Mac was the name used by author Derek McCulloch during his time as a presenter with the BBC. He also lent his name to Ladybird books in a series known as the 'Uncle Mac' books.
Whether he also allowed his name to be used on these puzzles is unknown at present.
Please let me know if you have any evidence to support, or deny whether reference to Uncle Mac on these jigsaw puzzles is related to Derek McCulloch. Thankyou