Sorry, didn't quite understand the question -
do you mean EVERY month?
Dave
(Interesting (hah, only to us nerds though) trivia point...THAT sketch is usually attributed to Monty P, but it actually dates from 'At Last, the 1948 Light Show' where it was originally performed by many of the Monty P cast....plus a few others. Ahem, but "Tell kids of today that and they won't believe you...").