Key to photograph. Please help identify the unknowns

Back Row: P.Ashcroft, B.Knight, O.Pascoe, B.Seaton, P.Heath, J.Parker, A.Ogden, D.Davis, unknown 4th Row: M.Greenhalgh, E.Twigg, unknown, B.Davis, J.Bowdler, unknown, F.Nixon, J.Loe, S.Kidd 3rd Row: M.Pearson, N.Mills, I.Ford, J.Piercy, D.Ball, unknown, unknown, J.Maxwell, J.Penney C.Needham, N.Worthington 2nd Row: M.Carr, N.Beales, P.Newton, Teacher, J.Parker, K.Chapman, M.Lucas Front Row: B.Procter, G.Cousins, L.Thom, W.Tootell, B.Rogers, S.Perry, J.Shaw