The interest comes not only from TV, but occasionally from Hollywood film producers (which Stephen thinks is mad!).
WHAT!!!?

Hollywood?!

Stephen's right. I for one would absolutely hate it if that Hollywood lot got their grubby paws on Fry and Cooper.
Unless they did a : Harry Potter.! IE: ONLY British Actors, and set ONLY in the North, and preferable a British or Scotish even Welsh writers who KNOWS the English language.
At risk of being called racist, an Americanised Fry & Cooper is, to me, aberrant.
The reason American readers love F&C is because it IS British, and the Hollywood shower would take the plot (ONLY) and put it in an American context, and blow the whole thing completely.
The way that Stephen writes, there's a certain feel to it, a texture if you like,
a picture of poignancy, a sliver hope...or dread, there's an ephemeral as too a permanence properties, accomplishment or even attainment that sadly is waaaay over Hollywoods head and can not be replicated. Silk purse out of a sows ear comes to mind.