Yea, I had a reply from Historical Dance UK who say "Galliard". - Their Fakebook

However U Tub videos show more refined (sedate) versions. More moves too. The Galliard above shows the stepping "on the move" which is not always the case in other videos. eg The same stepping but "on the spot" (as in the film) can be seen in videos of Pavane.

The signiture stepping is there in both dances and part of the sequence. I think its inclusion is much like ranting or, say, a Rigadoon step. Sort of "add at will" kinda stylee.

In the film the pace of the sedate promenade & vigorous stepping was chosen to simulate the "Perpendicular expression, of horizontal desire" as GBS put it. And FWIW pictures of the method of hold in La Volta supports this, which might be a visual "quote" from a similarly-minded wit of those days. Ooer missus, indeed!

thanx 4 replies, I have stopped digging now