Here's Pan's People making a guest appearance on Morecambe & Wise's 1975 Christmas Special. They're dancing with the boys while Brenda Arnau sings Big Spender.
In a style M & W often used, the routine starts as an apparently straight music number, focusing on the singer: only after two minutes have passed, about halfway throiugh the performance, do the boys appear, dressed as sleazy showgirls a la Sweet Charity, amongst Pan's People. Since the boys are the stars, obviously the camera stays on them: unfortunately as the routine is mimicking the Sweet Charity all-in-a-line choreography, that means we barely get to see Sue and Cherry at the ends of the line: only Ruth and Mary, right next to M & W, get much camera time.
Thanks to Andeebee for the YouTube post.