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Born in Wolverhampton, Insull trained as a joiner before entering showbusiness as a magician, "Hinsle, the Comedy Illusionist". He worked with his son, also Leonard, to construct ventriloquist's dummies until his son's death in 1957. His noted figures include Lord Charles for Ray Allen and Archie Andrews for Peter Brough.
- "insull". The Dummy Doctor. Retrieved 13 March 2012.
- "A Fine Quality Mid 20th Ventriloquist's Dummy Attributed to Leonard Insull", Doe & Hope
- Roy Hudd and Philip Hindin, Roy Hudd's cavalcade of variety acts: a who was who of light entertainment, 1945-60, p.3
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