I believe these all come from a terrific little antique shop in Penzance, Cornwall (England), though the one from 1944 might have a different origin.
The front of the postcard is first with the reverse, written side following.
(I can't believe someone actually sent this in the post!)
I don't have the faintest idea why this is sent to 'The Listening Room' at the Royal Courts of Appeal-- I've assumed these people worked there, though who on earth knows!!