French & Saunders school sketch

[jdav1e5]

Several years ago I saw a French & Saunders sketch in which they played a strict headmistress and her assitant teacher in long black gowns. It was extremely funny because it was definitely based on my own school (Northwich Grammar), which Jennifer attended.
I've since tried to find out what the sketch was called and whether it's available anywhere, but so far drawn a blank. There's a possibility it may have been for an early Children In Need. Any help finding it would be appreciated, thanks.

[eah]

If no other way available you could e-mail either French or Saunders from Google website addressand I`m sure they`d be happy to help probably Jennifer is best because of connection to school!