Yes, it's part of the BBC Genome project, which scanned all the Radio Times magazine listings from 1923 to 2009. Some recent (radio) programmes are available on BBC iPlayer, but still no sign of his Ancestral Voices tv programme, or his Pied Piper series...
Amongst the fascinating tv programmes Munrow appeared on were:
1. An edition of the music quiz Face The Music, on 7th December, 1974. http://genome.ch.bbc.co.uk/f0f42268b6114ef2a0f1508033df1227
2. So You Thought It All Started with Bach, presented by Clement Freud. http://genome.ch.bbc.co.uk/e7cb9f408d0b470bb46c0ae63c1bbc91