From Wikipedia:
In 1968, Lowe was cast in his best remembered role, as Home Guard platoon leader Captain Mainwaring in the BBC sitcom Dad's Army (1968–1977). Some colleagues on the show later remarked that the role resembled him: pompous and bumbling. Frank Williams said he felt this perception was unfair: "He certainly didn't suffer fools gladly and always knew his own mind, but he also had an ability to laugh at himself. Personally, I found him to be a most kind and generous man".[43] David Croft said Lowe had to be treated with kid gloves. He had firm ideas on what he was willing to do and never took his script home, which resulted in uncertainty over his lines.[44] He could be pompous and over time his part was written so there was a blurring of the line between actor and character.[44] An oddity of his contract was that he would never have to remove his trousers.[45]
Lowe held conservative political views and disapproved of the left-wing politics of his co-star Clive Dunn.[46] Dunn, in turn, described some of Lowe's opinions as outrageous, but as an actor rated him "ten out of ten in his field". Despite some tensions, Jimmy Perry described the cast as a "marvellous bunch of pros" with "no sort of volatile animosity between anybody".[46]
Clive Dunn's comments here reflect an attitude on the part of the left that was standard in those days — that an artist's genius (Jane Fonda, for example, perhaps a little self servingly) should be appreciated despite his or her politics. That tune has changed. Today's left sees nothing but politics.