Relatively few editions survive in the BBC archives, and they are rarely repeated, as the large number of writers who contributed to each edition and (in some cases) incomplete records of who they were mean it is difficult to get copyright clearance for repeats.
Relatively few editions survive in the BBC archives. They are rarely repeated. This was as the large number of writers. These writers contributed to each edition. These writers contributed to (in some cases) incomplete records. They were mean it is difficult to get copyright clearance for repeats.