This is edited from Wikipedia regarding Seamus Ennis:

"Late in 1951 he joined the BBC. He moved to London to work with producer Brian George. His job was to record the traditional music of England, Scotland, Wales and Ireland and to present it on the BBC Home Service. The programme was called "As I Roved Out" and ran until 1958."

OK as far as it goes, but some others involved in the programme which, as you say, was broadcast on Sunday mornings and which for many of us was our first taste of traditional performance, were Peter Kennedy, Hamish Henderson and Shaun (Sean?) O'Boyle.

By the way, BBC Radio 2 is advertising that John Tams will be singing a song/songs from the new radio ballad Ring of Iron during the Folk Awards.