Still looking to get some assistance from Bletchley Park...
Quote:
Those who are still alive are likely to be in their nineties but their memories may be sharp enough to recognise the type of code used, and explain how it could be deciphered.
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http://www.telegraph.co.uk/news/ukne...on-cipher.html
"Yes, well, without it's matching inbound pad I'm afraid it's quite impossible. More tea anyone?"
Stories from GCHQ of that era are some quite entertaining stuff, though, and a hat-tip to them.