[jdsnape]

I think it's probably from "I'm Sorry, I Haven't a Clue". I think the game was Film Club, there they have to suggest films that would appeal to a certain demographic. The demographic was "Cheese Makers", and the answers were "Cheeses of Nazareth", then others like "Fromage to Eternity", "The Rock Fort" etc.

https://en.wikiquote.org/wiki/I%27m_Sorry_I_Haven%27t_a_Clue

[dcminter]

Plausible, yes. Most of my cohort are fans of the late Humph & the gang. Barry Cryer, of course, wrote for a lot of other comedians so gags often originate from or propagate via him

[klipt]

> Blessed are the cheesemakers

Well, obviously it's not meant to be taken literally; it refers to any manufacturers of dairy products.