The message was on the wrapper for quite a few years.  As I said, I can't remember seeing it for a couple of years, but I don't eat fingers of fudge too often (they're always on the bottom shelf, near those cheap crappy sweets for little kids).
The whole wrapper seems to have changed actually, from the picture on the site: http://www.chocolatereview.co.uk/individual.asp?ID=97

A colleague from the office kindly bought everyone a finger of fudge today, and nice they were too.

I mentioned the sleeve message that used to be on the underside of the fold on the wrapper, which seems to have been removed.
I can't remember exactly how it went: something about a character flying round the Cadbury factory, firing fudge. 

I never understood the point of the message, and it's not a poor attempt at a double-entendre (even if the message sounded like one).  I think the last time I noticed it was a couple of years ago.

Can anyone remember this message/rhyme?  My colleagues are questioning my sanity on this one.