For a turn of the 1980s flash back to Leith Hall in 1979, About Britain made an episode on the Hall and NTS staff and life in at the property. Several old time staff feature in it as does Mrs Gascoigne. L Henrietta’s V O’Neill’s niece.
The episode can be accessed at:
https://movingimage.nls.uk/film/8370
This includes credits and production information