GCHQ has handed out the answers to the charming cryptocard its director Robert Hannigan sent out for Christmas, revealing that literally no one got all of it right. Three people came quite close, mind, winning themselves a... GCHQ paperweight and a copy of the biography of Alan Turing.
The complete answers have been published as a PDF by the GCHQ boffins, revealing the workings you'd need to have shown. But that no one did. Here they all are:
So there you go. Add that to that, divide it all by the other, 1 = a and some of the words only reveal themselves when held up to a mirror. Very clever. Easy when you can see the answers. [GCHQ via Metro]