Hi leeneia, yes, definitely Tulle! English humour hadn't descended to it's present level in the days of F & S. They did have a comment on that subject though, Bernard Levin had just used 'the' four letter word on live television for the first time. F & S produced a song which goes:-

Mum's gone out , let's say rude words,
Pee, po, belly, bum, drawers!

FC