Mid 1960s. The girl on the right is Lynn Francis. to her left is Gloria Atkins I think. The girls often played rounders on the Rec. I believe the sports teacher then was a Mrs Gray.
I can't be certain that this is Lynn in this photo, but the group photo on the same page, back row 2nd from the left, I'm sure is Lynn. I would imagine that this picture was taken at the same event. Probably some inter house rounders match. The Lynn Francis I knew lived in Treneere, and she would be mid 50s now.