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

The mere thought of Nora Batty kept them away.

The show depicts rural Yorkshire in the 1970s and 1980s. Yorkshire County Cricket Club only contracted its first Asian professional in 1992 . .

The show was set in a small town called Holmfirth which has a pretty much totally white population.

Or it certainly did in the 1970s to 2010 time period the show was made over.
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None in Herriot Country as yet.

No corner shops.