Its a wonder this movie has been recently shown on the TV in the UK, a certain movie called Saltburn is currently having a moment which bears many similarities.
This is a British 1960's romp in which an ambitious man happens upon an upper class waster who has been shunned social and lost his job as a result of being caught committing fraud. The lead sees this as an opportunity to climb the social ladder from his lower middle class rung onto the one occupied by the upper classes. He does this by offering the waster a proposition, free board in exchange for being taught the social ropes of the upper class. He agrees and that's where things get interesting.
In order not to spoil the plot, this does get very dark two thirds of the way through. Its tone is that of a dark comedy/satire and as a result its actually quite difficult to second guess where the narrative will go. As a result its a highly entertaining watch. Of course its dated in terms of music but not so much in terms of the upper classes who haven't budged an inch into modernity lest it alter their identity.
This would be a great companion piece to Saltburn as it is a very similar story but without the obvious meme generating scenes shoehorned into Saltburn which didn't add to the story, but were simply there in order to hijack social media and generate interest into what is at best an average movie. This one however manages to keep you engaged because its simply a well told story. Even if it is quite a bitter one.