I should have been more definite about the recording held by British Library - Pete MacGregor and I are certain it is Angela, and I seem to remember that Ted Poole, when I was interviewing him for the book, said that recordings of her had been sent to the British Library. Though when I was researching her at British Library they were unable to find anything in the sound library only ten of the books she wrote.
The Working Class Movement Library in Salford (a wonderful place and resource which everyone should visit and make a donation to secure its future) holds her archives but no sound recordings of her.
I have no idea what happened to either concertina, and no one seemed to know, though Ted Poole, as far as I know, still has her type writer! I've not been able to find a tune for the carters song. Incidentally, both 'The Scottish Carter' and 'The Blacksmith's History' are well worth reading and occasionally come up on e-Bay and Amazon, as do her pamphlets 'Verses against Fascism and War' and 'Sing and Stay Human'.