Thanks for the link to this wonderful video!

re: your query, I wonder if it is part of the decorative collar on the lady-in-waiting's long frock? Some elaborate beading perhaps? The Mistress of the Robes (The Countess of Euston, as she was until November that year when her husband succeeded as Duke of Grafton) The lady on the left, the Countess of Leicester CVO, Lady of the bedchamber, had a glittery gold edging on her dress. There is a lovely colour gif of the snippet of footage you mentioned at... HRH The Princess Anne and Ladies in waiting

A few questions from me: who is the lady that sits next to HRH Princess Alexandra and HRH The Princess Margaret? I wondered if Alice of Athlone, but no broad riband of the GCVO, just some left shoulder orders and medals. Could it be the Duchess of Beaufort (Princess Mary of Teck/Lady Mary Cambridge?) She had a CStJ, and would have received GRV's silver jubilee medal and GRVI and ERII's coronation medals. Any one else have any thoughts?

Also surprised that there are four ladies in waiting. (Although since 1998 there have been only 2 attend instead of the previous 3.) On the left, behind Princess Anne, the Countess of Leicester is wearing her badge of office as Mistress of the Robes Lady of the bedchamber and a CVO (see her in the same tiara at... Countess of Leicester, made a CVO on 1/1/1965, to her right the lady in waiting is wearing her badge as a lady of the bedchamber, to her left (the lady you are asking about is wearing just a CVO, and the final lady, in the buttercup dress is wearing no order or badge. Could the latter be Princess Anne's lady in waiting?

Cheers

DavoST