Some details of the archives in Birmingham:

Episode 11: https://discovery.nationalarchives.gov.uk/details/r/19c96e3a-fe5d-4688-90ad-8f857c615395
Episode 12: https://discovery.nationalarchives.gov.uk/details/r/8c3fcdd5-7a50-44ca-970d-bb92a7436ec7
Episode 13: https://discovery.nationalarchives.gov.uk/details/r/1ae11122-d054-471f-a3e7-620e1da781a6
Episode 14: https://discovery.nationalarchives.gov.uk/details/r/094c84d7-ddb4-4089-aa1e-19084139a61f

I assume they don't allow you to take the listening copies out of the building. I haven't looked into it lately but vaguely remember reading something like that a couple of years ago.

Naturally I'd never encourage anyone to break the law but if some scallywag with a laptop were to go there and rip the CDs, then upload them, I'd be absolutely outraged and would write a stern letter to the Daily Express. Ahem.

Birmingham: Archives, Heritage and Photography Service
Library of Birmingham
Centenary Square
Broad Street
Birmingham
B1 2ND