You are correct about Phillipa and according to Frank who has a great memory! these are some of the others in the class. There were 5 photos in total of the class in the link I posted
Robert Lynton-Jones, Tony Elliott, Robin Roberts, FWH, John Geler Williams, David Pritchard (back corner), Peter Palmer (chin on hand), Brian Moses, Ian Kay, Beryl Pierce, Phillippa Lewis, Susan Roberts (front) and Judith Barker-Ball.
He says the class was 5A, you took the class photo in 1965 just before O Levels