FOUND!
Lost Programmes.

Letter From America.

"Between them, David Henderson and Roy Whittaker had recorded 620 lost episodes of Letter From America, Cooke's radio programme that lasted an astonishing 58 years and included his thoughts on seminal moments in American history.

Both men also received a personal letter of thanks from Cooke's daughter in the United States.

Their thanks from the BBC included a short 'thank you' note, typed on the battered old Royal that belonged to the writer and broadcaster and was donated to the BBC in 2005.

From http://www.bbc.co.uk/ariel/21898284

Anybody else on our forum with (cough ) private recordings of old programmes?
Let us know..