Photograph of HRH Prince Charles and Princess Diana talking to the crowd during the opening ceremony of the Glasgow Garden Festival on 29 April 1988.

Photograph of the then Prime Minister Rt Hon. Margaret Thatcher and her husband Dennis Thatcher admiring an Aberdeen Angus bull at the Glasgow Garden Festival.

Photograph of the then Prime Minister Margaret Thatcher during her visit to the Glasgow Garden Festival.

Photograph of the then Prime Minister Margaret Thatcher admiring an Aberdeen Angus bull during her visit to the Glasgow Garden Festival.

Photograph of the then Prime Minister Rt Hon. Margaret Thatcher, her husband Denis Thatcher, and Malcolm Rifkind, the then Secretary of State for Scotland, standing before a large gateway during a visit to the Glasgow Garden Festival.

Photograph of the then Prime Minister Rt Hon. Margaret Thatcher and her husband Denis Thatcher signing the visitors' book in front of the Bowmore Distillers' Pavilion at the Glasgow Garden Festival whilst Malcolm Rifkind looks on.

Photograph of the then Prime Minister Rt Hon. Margaret Thatcher and her husband Denis Thatcher looking at a Clydesdale horse during their visit to the Glasgow Garden Festival.

Photograph of Prime Minister Rt Hon. Margaret Thatcher, her husband Denis Thatcher, and Malcom Rifkind, then Secretary of State for Scotland, enjoying refreshments at a café during their visit to the Glasgow Garden Festival.

Photograph of Prime Minister Rt Hon. Margaret Thatcher about to receive official gifts during her visit to the Glasgow Garden Festival.