To be honest I had never heard of TOTP till a few years back. The Sweet were on there constantly and on the Sweet board we have talked about this before--always synced. There is even a video somewhere of Sweet (don't remember what song) but Mick Tucker, the drummer, thru his sticks into the audience and you can still hear the drums distinctly. I know Solid Gold, American Bandstand, all those kind of shows, that's just the way it was.
Regardless, Don looks pretty darn good in that video!!!!