Hertfordshire, Tameside, and affluent parts of London and the home counties are facing a near impossible task to staff schools fully. In Hertfordshire, where high property prices are deterring staff from moving into the area, there are 261 vacancies. Several schools plan to use supply teachers or amalgamate classes.
Parents in East Sussex have been warned that some schools are likely to have to send pupils home early. The head of Oriel School, Great Yarmouth, Norfolk, has told parents that unless he can recruit six teachers, the start of term for classes not due to take exams will be put back for two weeks and pupils will return on a four-day week.
Enfield is among the worst affected London boroughs with 75 vacancies.
Alan Smithers, director of the Centre for Education and Employment Research at Liverpool University, said amalgamating classes was better than plugging gaps with staff who did not understand the national curriculum.