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In a thirty-year career, Stringer has appeared in numerous well-known British television shows, including The Bill, Open All Hours, Only Fools and Horses, Auf Wiedersehen, Pet, Coronation Street, Family Affairs, Minder, Johnny Jarvis, Butterflies, My Family and The Professionals. He also had roles in the films The Long Good Friday (1980), Clockwise (1986) and Personal Services (1987). He appeared in the British police drama, The Sweeney, episode 'One of Your Own', as gang boss 'Patsy Kearney'.
In The Bill he played PC Ron Smollett from 1990-1993 who was a likeable, hard working and honest cop.
Other roles have included a cameo role in Goodnight Sweetheart in the episode "You're Driving Me Crazy" as an undercover detective, and as a deputy headmaster Mr Sullivan in Press Gang (mainly appearing in the first two seasons). He appeared in the BBC drama Holby City, in an episode entitled "Doctor's Dilemma", on 18 June 2008.
Stringer has also made two guest appearances in the BBC sitcom Only Fools and Horses, in the episodes Go West Young Man, he plays an Australian and in Who Wants to be a Millionaire, he plays Del's old business partner, Jumbo Mills, who developed an Australian accent. He is also noted for his strong performance alongside Zig Byfield in the Minder episode 'The Old School Tie' from Series 2 in 1980 in which they play heavies in what is often claimed to be the most violent episode of the entire ten series.
- The Shout (1978) - Cobbler
- The Life Story of Baal (1978) - Taxi Driver
- That Summer! (1979) - Policeman
- The Long Good Friday (1980) - Billy
- Give Us This Day (1982) - Mr. Burton
- The Terence Davies Trilogy (1983) - Robert's Father (segment: Children)
- Clockwise (1986) - Det. Sgt. Rice
- Personal Services (1987) - P.C. Baker
- We Think the World of You (1988) - Butcher
- Stella Does Tricks (1996) - Edward
- Captain Jack (1999) - Chip Shop Owner
- Oliver Twist (2005) - Inspector Blather
- The Edge of Love (2008) - PC Williams
- I Know You Know (2008) - Mic the barman