[DanBC]

>All you have to do is find the codes used by Halifax W1037 ZA-U from 10 Squadron. The RAF would have records once you get that you can decode the message.

Those records could very well have been destroyed, either through war time action or subsequent fire or flood or other catastrophe, or deliberately.

>I thought the GCHQ had smart people working at it.

It's possible that they've decrypted it but are declining to say so. Don't forget that they've only just this year (60 or so years later) released some of the work of Turing.

[kevinprince]

UK didnt even acknowledge the existing of GCHQ or the Cipher Schools at Bletchley until 70's and 80's.