Subscribe annually by invoice. Both tiers include the current school year and the following school year. Historical archive available as a one-off licence for Intelligence subscribers. All prices exclude VAT.
Data collected directly from all 208 LEAs since 1996 · Every record sourced from the responsible authority at the time of publication
Your subscription covers two school years at all times: the current school year and the following school year. New school year data is published each May — May 2025 publishes the 2025-26 data. All active subscribers receive access automatically. No upgrade or additional payment required.
You can subscribe at any point in the year. A subscriber joining in October gets the current year immediately and receives the following year when it publishes the next May.
Immediate access to 2025-26 school year data. 2026-27 data delivered automatically when published in May 2026.
Immediate access to 2024-25 data. 2025-26 data published the same month — available to all active subscribers automatically.
Both tiers billed annually by invoice. No card payment. No automatic billing.
All plans include:
✓ All 4 nations — 208 LEAs
✓ Current + following school year
✓ School holidays, bank holidays, half terms
✓ Term start and end dates
✓ LEA reference data inc. pupil population
✓ /uk/v1/holidays and /uk/v1/leas
✓ 100 req/hour · 1,000 req/day
✗ INSET days
✗ Intelligence endpoints
Get in touchEverything in Calendar, plus:
✓ INSET days — included automatically
✓ /impact/{date} — pupils off on any date
✓ /impact/range — cumulative demand over a window
✓ /impact/catchment — single LEA status + context
✓ /peaks — highest-impact periods, ranked
✓ /calendar/divergence — cross-nation misalignment
✓ /compare — up to 208 LEAs in one call
✓ /historical/pattern — current + next year
✓ 2,000 req/hour · 20,000 req/day
Get in touchAll plans invoiced annually. No card payment. Prices exclude VAT.
| Feature | Calendar | Intelligence |
|---|---|---|
| School year access | ||
| Current + following year | ✓ | ✓ |
| Automatic May update | ✓ | ✓ |
| Holiday data | ||
| School holidays | ✓ | ✓ |
| Bank holidays | ✓ | ✓ |
| Half terms | ✓ | ✓ |
| Term start and end dates | ✓ | ✓ |
| INSET days | — | ✓ |
| LEA reference data | ||
| LEA list — all 208 | ✓ | ✓ |
| Region, name, pupil population | ✓ | ✓ |
| Intelligence endpoints | ||
| /impact/{date} | — | ✓ |
| /impact/range | — | ✓ |
| /impact/catchment | — | ✓ |
| /peaks | — | ✓ |
| /calendar/divergence | — | ✓ |
| /compare (up to 208 LEAs) | — | ✓ |
| Historical pattern | ||
| Current + next year | — | ✓ |
| Rate limits | ||
| Requests per hour | 100 | 2,000 |
| Requests per day | 1,000 | 20,000 |
| Historical archive (add-on) | ||
| Archive licence available | — | £8,999 one-off |
| Extends Intelligence endpoints back to 1996-97 | — | ✓ |
The historical archive adds access to all completed school years back to 1996-97 — across all Intelligence endpoints. It is a one-off licence fee, not a recurring charge. Every record was collected directly from the responsible Local Education Authority at the time of publication.
✓ Holidays and term dates from 1996-97
✓ INSET days from 1996-97 (Intelligence)
✓ Pre-calculated demand data where historical population data exists (Intelligence)
✓ /historical/pattern/{lea_code} endpoint
Access rules
Requires an active Intelligence subscription. Access suspends if the subscription lapses and resumes automatically on renewal — no re-purchase needed.
Extends all Intelligence endpoints back to 1996-97.
Internal use only. Redistribution or resale is prohibited. A signed licence agreement is required before delivery.
Loyalty discount
Customers who purchase the Historical Archive licence receive 15% off their annual Intelligence subscription renewals for as long as their subscription remains active. Full terms in the licence agreement.
Archive purchases are not self-serve. We review each request and issue a licence agreement before delivery.
Do prices include VAT?
All prices shown exclude VAT. VAT is added at the applicable rate for UK-based customers.
How does billing work?
All subscriptions are invoiced annually. There is no card payment or automatic billing. We issue an invoice before each renewal period.
Which school years does my subscription cover?
Your subscription covers two school years: the current year and the following year. A subscriber joining in October gets immediate access to the current year and receives the following year automatically when it publishes the next May — no upgrade or additional payment needed.
When is new school year data published?
New school year data is published each May. May 2025, for example, publishes the 2025-26 school year data — substantially complete across all 208 LEAs by the end of May. All active subscribers receive access automatically as soon as the data is ingested into the Semestern dataset. No action is required and no additional charge applies.
How often is the data refreshed?
The dataset is refreshed quarterly. Where a Local Education Authority issues a material revision or releases a substantial batch of future-year dates, an out-of-cycle update is released as needed.
What is the difference between Calendar and Intelligence?
Calendar tells you when schools are off. Intelligence tells you everything else. The Intelligence endpoints pre-compute the demand signal — how many pupils are off on a given date, what the cumulative impact is across a holiday period, which periods are the highest-impact, and how calendars compare across LEAs. Intelligence also includes INSET days, which are absent from Calendar responses automatically — no parameter needed.
How does the historical archive work?
The archive is a one-off licence fee (£8,999 ex VAT) that adds access to all completed school years back to 1996-97, across all Intelligence endpoints. Access requires an active Intelligence subscription — it suspends if your subscription lapses and resumes automatically on renewal. Customers who purchase the archive receive 15% off their annual Intelligence subscription renewals for as long as their subscription remains active.
Can I upgrade from Calendar to Intelligence?
Yes. Get in touch and we will apply a pro-rata credit for the remaining period of your Calendar subscription. The upgrade takes effect immediately on agreement.