We now have these episodes on CD (actually DVD RAM) - each file is 500MB in FLAC format. They have been digitised by an expert from reel-reel off-air recordings. They are just about broadcast quality. The search continues for the other episodes.

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2        Canvas, Hemp and Wood (intro / outro missing)
3        The High Seas        
4        The Merchants
5        Charts, Sea-Clocks and Stars        
6        The Complete Seaman
7        Stresses, Strains and Storms
8        The Long Blockade
11        Missing, Lost and Saved
13        Fisherman
20        The Dreadnought Navy
23        Jutland        
24        The Battle of the Atlantic, 1939-45 (first 45 min)

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Now what to do with the recovered recordings is a moot point.