This photo is identified as 3A in 1936 and as the pupils are in summer uniforms that suggests the school year 1935-1936 (confirmed by Ethel having started at the school in 1933). Ethel identified a boy in the back row second from centre as H.E. Mayncord (who died in November 2000), and the boy second from centre in the middle row as her brother F.J.F. (Jim) White (1932–1938). The girls in the front row are Beryl (Townsend) Dewhurst, Joan Tanner and Ethel White herself.
[It would be nice to identify the rest of the class so if anyone can help please contact the website.]