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This photo, from Gladys Dutton's collection, is marked 'Jonas, French Teacher'. Miss Jones, whose nickname at school was Jonas, is on the right. Both women are wearing panama hats and either a cardigan or a knitted dress.
It is possible that the beach may have been at Friog where the school had a beach hut. DWS girls went swimming there for many years.
In the background you can just see a girl in a swimming costume.