[3] In 1996 he joined the cast of CBBC's Out of Tune, a children's sitcom which focused on the lives of the member of a church choir, alongside James Corden and Jane Danson.

[4] He would go on to appear on BBC One's teenage game show To Me... To You... in 1998 before landing the role of Sam Smallwood in a seven episode stint on Channel 4's soap opera Hollyoaks.

[12][13] In 2009, Downie co-starred in BBC Four's Micro Men, a comedic account of the rivalry between 1980's British computer giants Sir Clive Sinclair and Chris Curry, opposite Martin Freeman and Alexander Armstrong.

[14] For the next two years, between 2010 and 2011, Downie would star with fellow actor Sam Heughan in a series of television commercials as part of an ad campaign for Tennents Lager in the UK.

[25][26][27][28][29] In 2015 Tim made a cameo appearance in Dave TV's mockumentary series Hoff the Record, which was loosely based upon the life of actor David Hasslehoff.

[34] He would go on to appeare in the made-for-television film Young Hyacinth, a prequel to BBC One's sitcom Keeping Up Appearances, an episode of Channel 4's online short video vehicle Comedy Blaps entitled Filcher & Crook, several episodes of Comedy Central's Drunk History: UK, and a regular role as Christopher (Kit) Marlowe in Ben Elton's ongoing sitcom Upstart Crow.

[41][42][43] 2018 saw Downie cast as recurring character, and real-life historical figure, Governor William Tryon in STARZ's television adaptation of Diana Gabaldon's best selling Scottish time travel novel Outlander.

[45][46] Later that year he appeared in creators Justin Sbresni and Mark Bussell's YouTube series Housebound, which focused on ordinary life in the era of COVID-19 lockdown.

[64] Two years later Downie would appear as explorer Montgomery Clyde in the family film Paddington, which was based upon author Michael Bond's series of children's books.

[68] The next year he would feature in independent film The Mercy, the true story of Donald Crowhurst (Colin Firth), an amateur sailor who participated in the Sunday Times Golden Globe Race in 1968.

[70] It was announced in 2018 that Downie had been cast in Citrus Film's Horrible Histories: The Movie - Rotten Romans, an adaptation of the best-selling children's historical comedy books from Scholastic.

[76][77][78] He also appeared in1966 World Cup Final (2002) on tour around the UK, Pawnography, and Le Jet De Sang at The Rose (theatre) in London 2007, part of their first residency in 500 years.

[86] Downie would reprise his role in four animated web shorts[87][88][89][90] and in two episodes of High Rollers, a Dungeons & Dragons livestream, featuring the other companion voice actors playing their respective characters.