As Leo says, the school were are still, not very helpful with supplying information.
I was in the school with my elder and younger sisters during 1942-1944 living in the rented properties for the school in Moor Park-Sandy Lodge. My house, called Tile House, was a few minutes walk away from the railway station. I had left by the time the school was re-instated back in Hampstead but my two sisters went back there.
I had even asked them if, in their archives, they still had photographs taken during that time of all the school. There were several large ones taken besides the ones of girls who were privilaged to spend holidays in Sweden. There was no response from them for this request. I sincerely hope they have not discarded them for fear of being associated with the old school, now that they are the Royal School with their patron as Camilla Winsor.
My desire would be to get copies of these photographs to show my children, who now have children of their own.