In Last of the Summer Wine, why are there no Pakistanis?

It filimed a long time ago, and set (and filmed) in a rural village unlikely to have any immigrant residents in that era. They congregate in the larger towns where they are more likely to find work and accommodation.

Given its location, I don't suppose there are many even now in the real Holmfirth used, and similar villages, unless professionals like doctors or solicitors, due to the high prices of homes in scenic, rural parts of England.