The British Library holds a lot of Peter Kennedy recordings.Here is a link to the collection
https://sounds.bl.uk/World-and-traditional-music/Peter-Kennedy-Collection
" These are a small portion - approximately 150 hours of a total of around 1500 - of the field recordings Peter Kennedy (1922-2006) made during the four decades in which he was very active "in the field": 1940, 1950, 1960 and 1970. He began collecting songs and dances, encouraged by folk collector Alan Lomax, in order to demonstrate that the folklore tradition was still alive in Britain and Ireland. "