The survival or otherwise of regional and national t.v. folk programmes may be debated at:
Also a search here might be fruitful ...
Then use the 'Search Lost Shows' search option.
Example ... here's a lost show that will never see the light of day again ...
The existence of shows in the dusty archives however does not mean that they can be accessed, viewed, or copies obtained; and indeed their continued survival relies upon the expertiese and inclination of the donors &/or curators.