Halcyon London International School vs Southbank International School
🇬🇧 London · Side-by-side comparison on verifiable public data.
Both carry a public inspection verdict: Halcyon London International School is Independent Schools Inspectorate (ISI) "Met all standards (2024 routine, post-2023 framework)" and Southbank International School is Independent Schools Inspectorate (ISI) "Met all standards (2024-2025, post-2023 framework)" — a rare pairing where an official quality rating can be compared head-to-head. Both run the same curriculum (IB), so the differences come down to pathway detail, campus culture, and specific language/boarding arrangements rather than the curriculum framework itself. On cost, Southbank International School has the noticeably lower entry fee — a material difference for budget-conscious families. See the table below for the figures, and verify against each school's own published fees.
Key Facts
| Halcyon London International School | Southbank International School | |
|---|---|---|
| Curriculum | IB | IB |
| Ages | 11-18 | 2-18 |
| Languages of instruction | English | English |
| Annual fees | £41,040-£42,912/year incl. VAT (2026/27) | £6,724-£16,033 per term (2025/26 Early Childhood half-day to DP; 2026/27 DP up to £16,033) |
| Enrollment | 172 | 800 |
| Boarding | Day only | Day only |
| Inspection rating | Independent Schools Inspectorate (ISI): Met all standards (2024 routine, post-2023 framework) | Independent Schools Inspectorate (ISI): Met all standards (2024-2025, post-2023 framework) |
| Accreditations | IB World School, ISI-inspected (DfE-regulated) | IB World School (PYP, MYP, DP), Independent Schools Association (ISA) member, ISI-inspected independent school |
Strengths
- ✓IB Diploma average of 35 for the Class of 2025, above both UK and world averages, with recent perfect scores of 45
- ✓Continuous, focused IB pathway (MYP then DP) delivered by subject specialists with strong inquiry-led teaching
- ✓Small, intimate community (around 172 pupils) enabling close staff-pupil relationships and individual learning mentors
- ✓Genuinely international, largely bilingual student body with a strong inclusion, diversity and global-citizenship culture
- ✓Innovation-led ethos, including documented integration of artificial intelligence into the curriculum
- ✓Full IB continuum (PYP, MYP, DP) authorised end-to-end, ages 2-18, within one school
- ✓Strong published DP outcomes: Class of 2025 average of 35.4 against a 30.58 global average, with three perfect 45 scores
- ✓Highly international community of around 70 nationalities reinforcing genuine international-mindedness
- ✓Embedded EAL support enabling students with little or no English to access PYP and MYP
- ✓Central-London campuses across Hampstead, Kensington and Westminster offering catchment flexibility
Trade-offs
- !Limited on-site sport and outdoor space; inspectors asked leaders to extend outdoor and physical-skills opportunities
- !Operates within a shared, leased central-London building rather than a self-contained campus
- !Young school (opened 2013) with a comparatively short track record
- !Small scale and secondary-only remit limit breadth of facilities, cohort size, and alumni network versus larger London internationals
- !Premium fees, with DP at up to £16,033 per term inc. VAT for 2026/27 plus deposit and capital charges
- !Recent ISI inspections use a met / not-met framework, so no top graded band evidences excellence
- !Programmes split across separate campuses rather than one continuous all-through site
- !Day-only school with no boarding provision
Best Fit For
- • Internationally mobile families wanting an unbroken IB MYP-to-Diploma route in central London
- • Bilingual or multilingual students, including those targeting the IB bilingual diploma
- • Families who value a small, close-knit, innovation-led environment over a large traditional campus
- • Students who thrive on inquiry-based learning rather than a GCSE/A-level track
- • Internationally mobile families wanting a single IB pathway from age 2 to 18
- • Students who thrive in a multilingual, multinational peer group
- • Families targeting strong IB Diploma results for university entry
- • Children needing structured EAL support to enter an English-medium programme
University Placement
School-reported · not independently verified
School-reported, unverified: the Class of 2025 saw graduates progress to Russell Group universities and to specialist art, music and drama colleges in the UK and internationally.
School-reported, unverified: Southbank describes itself as 'London's leading International Baccalaureate (IB) School' and reports three Class of 2025 students scoring a perfect 45, placing them in the top 1% globally.
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Frequently Asked Questions
Should I choose Halcyon London International School or Southbank International School?
Halcyon London International School is best for: Internationally mobile families wanting an unbroken IB MYP-to-Diploma route in central London. Southbank International School is best for: Internationally mobile families wanting a single IB pathway from age 2 to 18. The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between Halcyon London International School and Southbank International School?
Halcyon London International School: £41,040-£42,912/year incl. VAT (2026/27). Southbank International School: £6,724-£16,033 per term (2025/26 Early Childhood half-day to DP; 2026/27 DP up to £16,033). Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do Halcyon London International School and Southbank International School offer?
Halcyon London International School: IB. Southbank International School: IB. Halcyon London International School inspection: Independent Schools Inspectorate (ISI) "Met all standards (2024 routine, post-2023 framework)". Southbank International School inspection: Independent Schools Inspectorate (ISI) "Met all standards (2024-2025, post-2023 framework)".
Do Halcyon London International School or Southbank International School offer boarding?
Halcyon London International School: day school only. Southbank International School: day school only.
Questions parents ask
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →