A Canterbury Tale is a wonderful example. There's no major plot - but there's a great story. As the viewer you soon find out who the glue-man is, although the other characters don't find out until later. So it soon becomes a Whydunnit rather than a Whodunnit. But most of the glue-man story is a bit of a red-herring, or a MacGuffin. The real purpose of the film is to explore the characters, not just the stars but those in smaller roles as well. And of course the countryside. The landscape should really have a credit as another character.
It was made at a time when it was known that the good guys would win the war. They wanted to explore just what it was that everyone was fighting for. But they didn't say that everything must be set in aspic and preserved exactly as it was. It was an occasion for major change. So they wanted people to look to the future but to remember the past.
When it came out it was received well enough, but it wasn't a huge hit. P&P had mis-judged it slightly. Everyone was too busy finishing off the war and dealing with the immediate aftermath to be concerned about such things. It's only in the years since then, now that people have more time to consider such things, that it's really been appreciated.
Steve