This clip is part of a longer medley. It shows the first 80 bars of the dance with a couple of changes. For the rondels in bars 17-24 the instructions say the outer couples should make the arches, but here the inner couples do. Also in bars 45-48 the promenading couples loop round clockwise rather than anticlockwise. Then, from about 19:52, the last 16 bars (hands across & casting then circle) are replaced with other choreography to link into the next dance in the demonstration.