The longest serving Blue Peter presenter died aged 83 in May this year.
This tribute looks back at his life with contributions from the people who knew him best.
John was famed for his daredevil antics during his 12 years on the show, including climbing Nelson’s Column without a harness, and achieving a world-record breaking five-mile free fall.
Then, of course, there was his famous phrase, ‘Get down, Shep!’ as he tried in vain to control his beloved border collie.
John’s widow Vicky reveals what he was like off-screen, while co-presenters including Peter Purves and Valerie Singleton reminisce.