If you select the ‘Centre types’ option, the visualisation will show 9 school and college types, as categorised in the National Centre Number (NCN) register. Centre types are self-reported by schools, colleges, and other exam centres according to the following categories:
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Academies
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Free school
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Further education establishment
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Grammar schools
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Independent or private school including city technology colleges (CTCs)
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Local authority maintained secondary comprehensive schools
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Secondary modern schools
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Sixth form college
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Other (e.g. pupil referral unit (or alternative provision), hospital, prison-educational unit, non-teaching centre, part time teaching centre, distance learning centre, independent vocational training provider)
The visualisation reports centre types as classified in the NCN register. Schools and colleges self-report their centre type by choosing a single category from the 9 options above. These categories are not mutually exclusive. This means the accuracy of the data in the visualisations depends on how accurately and consistently schools and colleges have classified themselves. However, to improve the accuracy of the grammar schools category, some grammar schools recorded in other NCN categories were reclassified as ‘Grammar schools’ using information from the Department for Education’s Get Information about Schools (GIAS) register to identify whether a school’s general admission basis was selective or non-selective.
We have used the centre type reported for the summer 2026 awards and applied this categorisation across all years in the visualisation. This may introduce a small proportion of classification errors for earlier years where schools or colleges changed categories before 2026.
If you select ‘State-funded vs Independent’ option, the visualisation will show the following three centre (school or college) types:
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All state-funded
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Independent or private school including city technology colleges (CTCs)
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Other (e.g. pupil referral unit (or alternative provision), hospital, prison-educational unit, non-teaching centre, part time teaching centre, distance learning centre, independent vocational training provider)
Independent and Other categories are the same NCN categories shown in the list above. All state-funded category includes schools and colleges from the remaining NCN categories: Academies, Free school, Further education establishment, Grammar schools, Local authority maintained secondary comprehensive schools, Secondary modern schools and Sixth form college.