{{explanation}}
Circle, Man has Lady on his right

1-8
: All dance Grand Chain changing places RH with partner to start &
  passing 4 dancers in total (2 bars per hand)
9-16
: All turn 5th dancer RH to face in, retain RH & advance into centre. Man
  passes Lady in front into next place clockwise
17-24
: Ladies 1/2 turn new partner RH, lead out & pass new partner in front
  into next place clockwise & turn next dancer LH
25-32
: All circle left, pull back LSh & chase back