Here are Lulu and Sue on TOTP, in nautical outfits doing a few hornpipe steps, behind Paul Nicholas, who's singing Dancing with the Captain. Yes, it's clunky literal references time again.
Although both went on to become members of Legs & Co., Lulu & Sue were members of Ruby Flipper at this point.
Update: This old embedded video clip is broken: and a higher quality version has been posted here.
Download from Rapidshare (34.4 MB).