Halcyon London International School

Halcyon London International School is listed in Department for Education / GIAS in London, United Kingdom. The reported teaching range is Ages 11–18. The source reports 157 students. Its published address is 33 Seymour Place, W1H 5AU. Source reference: 2026-11-08. Use the source record or the school directly to confirm current admissions, programmes and availability.

Halcyon London International School is listed as a other institution in London, London, United Kingdom. Institution type: private. Reported grades or age range: Ages 11–18. Reported enrolment: 157 students. Listed address: 33 Seymour Place W1H 5AU. Source: Department for Education / GIAS (2026-11-08). Contact the institution directly to confirm current admissions, fees, programmes and operating status. Missing fields mean the source did not supply the information. Directory facts are not a quality rating.