There was a BBC Documentary - Code-Breakers: Bletchley Park's Lost Heroes back in 2011 that explains all about the work Tommy Flowers and Bill Tutte did.

Looks like you can watch...

Thanks! That will do nicely to just identify people.

The LIKE '%[^A-Z,a-z]%' works on non-latin based languages so is kind of useful for something else

🙂