The two Birmingham Ballads - The Cry from the Cut' and 'The Jewelry' are extant in the public domain. Aired once but never heard again - until now. Thanks Jim.
There was also The Iron Box (aired but once)- about blacks in the US prison system, and Romeo & Juliet (even re-aired last year) - a mods & rockers version of the classic theme - these too are around. Again thanks Jim.
Meanwhile there was Offlimits - a series of 6 RBs about the lives of black soldiers in the Vietnam war. These were never aired by the Beeb as being too controversial. Only ep. 2 is around.
Another RB was about the Cowley car works - The Factory - but this is not around.
Meanwhile the format endures with youngsters and such as the Ballads of the Great War series. And then there was the Olympics of 2012.
BTW the Radio Ballads TV versions - three - are on YouTube.
And all of the above were Brit. creations.