The available instructions say "Taught by Miss Milligan during her visit in Apr-May 1975".  These instructions have an error, see the two cribs.

Stephen Webb, in <<https://my.strathspey.org/dd/issue/2336/|issue 2336>>, gives details of the corrections made on the spot by Jean Milligan at that London Branch day school. This information is not yet incorporated in the cribs.