The BBC were supposed to have made a recording of the big C floor compressor at Oakeley in the 50s or 60s - never been able to trace it though.
Grahami
There is a very high probability it is lost. A lot of the BBC's material from that era is missing/lost. Even material that commanded high viewing/listening figures was lost/recycled/disposed of. Little remains of the first series of Dr Who, nothing remains of the first 2 series of Goon Shows.
~~~ The future is not what it used to be ~~~