So it's time finally to let the cat out of the blog. I'm producing a comedy benefit gig - with just a tiny bit of help from people who actually know what they're doing - to celebrate the astonishing achievements of those jolly clever men and women who worked in tip-top secret at Bletchley Park to crack the fiendishly fiddly codes being used by the Germans in WWII.

The show will be on Tuesday November 3rd at The...