He was also a regular performer at the 'Country Meets Folk' radio shows.

http://genome.ch.bbc.co.uk/search/0/20?adv=0&q=derek+brimstone&media=all&yf=1923&yt=2009&mf=1&mt=12&tf=00%3A00&tt=00%3A00#search

I wonder how many of those shows are still extant in piles of cassette recordings in folks attics?