GCSE results in Guernsey, 2008–2025.

1. 2016–17The States vote to end selection at 11, confirming it in a second vote the following March.
2. 2018The last 11-plus is sat.
3. 2019The mainstream secondary schools take their first all-ability Year 7 intakes.
4. 2023The last selectively-admitted pupils leave. Guernsey Grammar School & Sixth Form Centre is renamed Les Varendes High School, and every States 11-16 school is now non-selective. That makes 2023 the last GCSE year whose cohort included grammar-selected pupils, and 2024 the first fully non-selective one.

Read this carefully. The figures above are island-wide and cover the same pupils either way — ending selection changes which school a child attends, not who sits the exams. So the fall in Attainment 8 after 2023 is not mechanically explained by the reform, and equally cannot be attributed to it without evidence this page does not have. It is shown as context for the timeline, not as cause and effect.

Reports are published at gov.gg, not in Ofsted’s own public database — searching reports.ofsted.gov.uk for a Guernsey school returns nothing usable. Before 2022 Guernsey ran roughly two decades of validated self-evaluation against Education Scotland’s framework; those reviews used a different method and are not shown here. Coverage gap: Notre Dame du Rosaire was also inspected in March 2023, but that report is not on gov.gg's archive page and could not be retrieved.

Guernsey’s 2022 household income survey put median gross household income at £55,116 (mean £74,568) — a household, not per-head, figure, so it isn’t directly interchangeable with the series below. The nearest granular England equivalent is ONS’s gross disposable household income (GDHI) per head, by local authority: on that measure, Windsor & Maidenhead (£38,211), Wokingham (£32,259) and Richmond upon Thames (£51,388) — all 2024 — sit well above the roughly £25,000–26,000 England/UK average. All three are also fully comprehensive systems, like post-reform Guernsey: no grammar schools, so — unlike Buckinghamshire or nearby Kingston and Sutton, similarly affluent but selective — income and selection aren’t tangled together in this comparison.

Guernsey’s figure is 2025; the England figures are 2023/24, the latest year local-authority-level Attainment 8 has been published as a downloadable dataset — a year’s gap, not a strictly like-for-like single year, though Attainment 8 does not typically move sharply year to year.