Maclagan, Richmond Herald.
That the record is incomplete is admitted by the author of the article.
I can add a little bit to the story. Although the O.U. Heraldry Society may have been inactive at some times in the second half of the 20th century, Michael Maclagan, history tutor at Trinity College, Oxford was active through the 1980s as Richmond Herald.
HERALDRY: Oxford Superlink