# The Education (School Performance Information) (England) Regulations 2007, Paragraph 1


(1) In relation to any maintained primary or middle deemed secondary school, the number of pupils of compulsory school age registered at any time on or before the Friday before the last Monday in May during the reporting school year.
(2) In relation to any Academy or CTC with registered pupils aged 15 years and any maintained secondary school, the number of pupils of compulsory school age registered at any time on or before the second Monday in April during the reporting school year.
(3) For the purposes of this Schedule, a pupil is of compulsory school age unless before 1st September in the reporting school year—
(a) he has not attained the age of five years; or
(b) he has attained the age of sixteen years.

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Source: https://www.legislation.gov.uk/uksi/2007/2324/schedule/5/paragraph/1 (the official version)
Page: https://openlegislation.uk/education-school-performance-information-england-regulations-2007/schedule-5/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.