The French film from 2018 "An Impossible Love" is well worth watching for the Renault 4 action. It's a lovely, dark red, fairly early example that remains impossibly shiny and pristine despite about 12 years passing and it never apparently seeing a bucket and sponge. This film was shown on the BBC and is available on the iPlayer. Warning: part of it fairly early on is a little "racy" dans le chambre but it's done quite artistically and never tackily.