Theory: someone made this movie on a bet. Namely, a bet that they couldn't make a movie titled Vacuuming Completely Nude in Paradise. So they won. I think the plans must have been something like: "Let's take Glengarry Glen Ross, and make it a comedy, and put it in England, and have them sell vacuum cleaners door-to-door instead of real estate, and make everybody even more pathetic and repulsive."
I got this movie because it was directed by Danny Boyle, who also directed 28 Days Later and Millions. It features an impressive performance by Timothy Spall. It's just way too strange for me to recommend it, but it was certainly unusual. A bit predictable at the end, though.