Try the national sound archive at the brithish library. You know that when a book is published it goes to them, the same is true of records etc.
NOW, the problem is that the british library says that the B.B.C do not give permission for their stuff to be copied or looked at. If you can crack it then please send me a p.m of how you managed it. My mudcat name is as above "Steve benbows protege." Anything is worth a try and "If you don't ask then you don't get!"
Good luck and happy hunting.
From memory the web adress is www.bl.uk