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In January 2008, there were 40 head teacher posts in Yorkshire and the Humber Government office region that were either vacant or temporarily filled. In England, there were 550.
Posts were counted where there is no incumbent who is expected to return to the post, whether or not it is filled or on a temporary basis, whether or not advertised or an appointment has been made and not yet taken up.
Source:
The source of this information is the Annual Survey of Teachers in Service and Teacher Vacancies, 618 g.