Indeed he was.
His office is preserved in Bletchley Park, with (allegedly) his mug padlocked to a radiator so no-one else could use it. I even bought my dad a book called Enigma (or something with Enigma in the title) for Christmas last year (from the Bletchley Park shop). (EDIT: Actually I don't think it was called Enigma, but Colossus).
I considered Miruvor, but couldn't make it work! - uv - very clever. I couldn't do anything at all with the unseen rays! I was convinced it started with mir (jewel) but couldn't do the rest ... no luck putting fea on the end (although I did trying suffixing it with the word gin!)
Galadriel, why did you think the T clue began TO?
Time for another, as we're all awake?
1. Hama’s initial finale as a gardener’s son.
2. French cup changes note for a Telerin digit.
3. Strange the Italian should merge in this elf.
4. One buttery biscuit that Finrod loved.
5. Near palindrome and heir apparent.