[1] Born in Shanghai, Judd and his English father and Russian mother fled when the Japanese attacked China five years later.

Judd was also known for the 1975 "Think Once, Think Twice, Think Bike" campaign to make motorists aware of the risks faced on the road by motorcyclists.

[2] Judd's success in The Day the Earth Caught Fire saw Columbia Pictures sign him to a long term contract.

[citation needed] In the early 1990s, Judd lived in the Phoenix Hotel in Wimbledon and was a credit officer for a Canadian investment bank.

Judd was married twice; his first wife, who had also appeared in The Day the Earth Caught Fire, was actress Gene Anderson, who died suddenly aged 34 from a cerebral hemorrhage whilst filming Z Cars: The Share Out in May 1965.