When was this Royal visit?

When and why did Princess Margaret visit Peterhead?
When and why did Princess Margaret visit Peterhead?

This photograph came from the archives of Peterhead woman Elizabeth Cow's photo exhibition.

HRH Princess Margaret appears in the picture visiting Arbuthnot House - but what was the occasion?

Can any of you tell us when the visit occurred and if you were there to welcome the Royal visitor to the Blue Toon.