{{explanation}}
Longways set in Glasgow Highlanders positions

1-8
: 2L followed by 1M dance also 3L followed by 4M dance Figs of 8 on sides
  round 2M+4L/3M+1L (dancing in front of partners to start) ending
  with 2L+1M at top facing down & 3L+4M at bottom facing up
9-16
: All set twice (in sq formation), turn 'corners' (Men RH & Ladies LH) to
  end on sides (Men's side 2L 1L 3M 4M & Ladies' side 1M 2M 4L 3L)
17-24
: 1L followed by 3M also 4L with 2M dance Figs of 8 across
  round 1M+2L/4M+3L & back to each other's place (2L 3M 1L 4M
  & 1M 4L 2M 3L)
25-32
: Two middle couples set & dance RH across 1/2 way, all set & cross to
  original places
33-40
: All set & dance "La Baratte" with the opposite person:

: Men 1/2 turn Lady RH & retain hands but at arm's length from each other

: Men retrace steps with Lady turning right under Man's arm briefly into
  Allemande hold (Man behind Lady facing Ladies' original place) &
  releasing Ladies' RH, she turns under Man's left arm until almost in
  original places & then they change places LH to opposite places
41-48
: All In prom hold with partner promenade 1/2 way round clockwise, 3s+4s
  (at top) also 1s+2s dance RH across