Dunn, who was also a successful stage singer, secured one of Britain's biggest novelty pop hits with Grandad.
It gave him a No 1 hit in 1971 and spawned a successful children's comedy series.
The actor's fledgling film career was interrupted by military service in World War II, when he served with the 4th Queen's Own Hussars, spending four years in prisoner-of-war and labour camps in Austria. He once described his Dad's Army success as payback for his time incarcerated.
Returning to civilian life, Dunn employed his comic talents alongside Tony Hancock before securing the role with which he would forever be associated.
Although they combined an extraordinary chemistry on screen, Dunn and Lowe, who played Mainwaring, regularly argued about politics. Dunn was a lifelong socialist, while his fictional superior officer was a staunch supporter of the Conservative Party.
- Independent