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Daphne du Maurier and the Queen Mother - thought to taken during a picnic on a shoot near Balmoral in the 1950's.
Candid never before seen photos of the Queen and Prince Philip have come to light.
The snaps, which are believed to date from the late 1940s and early '50s, show the couple in a relaxed setting away from the public gaze.
One of the images reveals a youthful Elizabeth sitting on a blanket eating sandwiches next to Prince Philip.
She is wearing a tartan skirt and the prince is resplendent in country attire, including plus fours.