It is the first episode to feature Anne Yarker and Jonathan Seeley as Virginia's children, Alice and William, and Karen Dotrice as the maid Lily Hawkins.
"On with the Dance" opens some months after the end of World War I on 19 July 1919, and the Victory Parade is passing near Eaton Place.
Edward and Daisy have left service and been replaced by Frederick Norton, James's former batman, and Lily Hawkins.
Richard and Virginia return from their honeymoon in Paris, having also been to Versailles for the signing of the eponymous treaty, and they start looking for a new house.
However, a week or so later James and Georgina entertain Virginia's children, William and Alice, for the afternoon while she and Richard go shopping.