It'd be cool if they let you in on how the code was deciphered. Does anyone know of any sources that discuss the process? Sounds like in this case frequency analysis wouldn't have cut it :D
Edit: Link to the actual Archives entry: http://discovery.nationalarchives.gov.uk/details/r/C12056
http://www.rtve.es/alacarta/videos/telediario/td2-codigo-020...