- At one point early in his career, before he was hired by the BBC, he drew murals on restaurant walls in exchange for food.
- Suffered two strokes which left him unable to use his hands. He described the loss of his ability to draw as the greatest challenge in his life. He said: "Not being able to draw is the greatest cross that I have to bear, for it has been my lifetime passion.".
- He appeared in up to three TV series every year for the next 50 years up to 1994 with 'Hartbeat'.
- Created the original Blue Peter badge.
- His break in television was in 1952, after he met a BBC producer.
- BBC awarded him a contract to appear as an illustrator on Saturday Special.
- Brother of British television director Michael Hart.
- He wanted to join the RAF during WWII, but was rejected because of slightly deficient vision. He joined the Gurkhas instead.
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