Classpot

Halcyon London International School

Westminster, W1H 5AUSecondaryAges 11–18MixedPrivate

About Halcyon London International School

Halcyon London International School is an independent day school in Westminster, London, for pupils aged 11 to 18 for boys and girls. GIAS records 157 pupils on roll and a published capacity of 230.

Figures can refer to different reporting periods. Check the date and source shown beside each section. How Classpot uses published data.

GIAS school facts

Official identity and contact facts; operational fees and services appear only when separately reviewed.

Age range
11–18
Education stages
Secondary, Sixth form
Gender
Mixed
Pupils on roll
157
Published capacity
230
Inspectorate
ISI inspection regime
Day-school evidence
No boarders; Does not have boarders
Area classification
Urban: Nearer to a major town or city
Address
33 Seymour Place, London, Westminster, W1H 5AU
Telephone
02072581169
School website
Visit official website

Source: GIAS establishment record · published 20/08/2026

Pupils and staffing

Official figures for 2025/26.

Pupils
157
Girls / boys
65 / 92
Teachers (headcount)
48
Teachers (FTE)
42.5
Pupils per teacher FTE — not class size
3.7
Area classification
Urban: Nearer to a major town or city

Source: official publication (04/06/2026) · official publication (04/06/2026)

Destinations of 2022/23 leavers

Historical DfE destination measures; these do not describe the current leaving cohort.

Level 3 cohort
22
Sustained destination
59.1%
Higher education
50%

Source: official publication (23/04/2026)

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