[4] Timothy's first professional stage engagement was in the play Chips with Everything in London and New York, in the role of a RAF military policeman for more than six months.

[5] Timothy's television career started with the 1969 series Take Three Girls, and he went on to appear in UFO (1970 episode "The Psychobombs"), Doctor at Large in 1971, Some Mothers Do 'Ave 'Em in 1973 and Murder Most English: A Flaxborough Chronicle in 1977 before winning the role of Herriot.

[6] Timothy later recalled meeting the author, Alf Wight, who had "a soft, lilting Scottish accent – though I was told to keep my speech neutral to retain the universality of the part.

[7] His film career included roles in Here We Go Round the Mulberry Bush (1967), Alfred The Great (1969), The Virgin Soldiers (1969), Spring and Port Wine (1970), The Mind of Mr. Soames (1970), Up the Chastity Belt (1971), and the sex comedy Eskimo Nell (1975).

More recently he has appeared in Lewis (ITV1) in the episode "Wild Justice", The Grapes of Wrath, All the Fun of the Fair, Haunting Julia and Casualty (2014).

As the person in these advertisements, he became a character, a role, in the 2017 stage production of Ink, a play about Australian Rupert Murdoch's start on Fleet Street in British newspaper publishing with The Sun.

[14] In April 2017, it was announced that he would be joining the BBC soap opera EastEnders as regular character Ted Murray, in which he made his last appearance on 27 September 2019.

In February 2020 Timothy appeared in Shakespeare & Hathaway: Private Investigators as Major Terence Benedick episode #3.3 "The Sticking Place".

Peter Davison was asked to take on the role, because his home was equipped with a recording studio, allowing him to complete the project in spite of the lockdown.