Marcus, I listened to the Becket Whitehead recordings by going down to Cecil Sharp House in London (where they are held in the VWML), but there would probably be a charge for a non-member of EFDSS.

The recordings were made by Seamus Ennis as part of a BBC folksong recording project in the 1950s, in which the late Peter Kennedy was involved. Some of the recordings have been issued by Topic Records (on Voice of the People 2), and some of Kennedy's own material is on the British Library online sound archive, but not the Whitehead recordings (see above).

Camsco Music in the USA owns the licenses for Kennedy's Folktrax label (about which there has been much controversy that probably won't interest you) - this included a lot of the BBC recordings.

I believe I have the recording of 'The Gallant Poacher' somewhere, so PM me (hit the 'PM' button after my name above) with your email address, and I'll see what I can do.