Schools on a British curriculum
Schools
Families who want a British curriculum, in Thailand or elsewhere, should start with a current directory and then open each school's own admissions and fee pages.

A school that describes itself as following the English national curriculum, IGCSE, or A levels may still set its own fee schedule, its own calendar, and its own rules about uniforms, transport, and examinations. Those details belong on the school's current pages, dated to the school year you care about. A brochure without a year is not enough.
A current public directory, or names you already have, is one way to collect current school names. A listing is not an endorsement and it is not itself a fee table. Use it to reach each school's own page, then read the fee document and the admissions rules for the year you need.
State-funded schools in the United Kingdom have a separate admissions system, usually run by a local authority. Those rules and dates belong on the official local-authority or school page. This guide does not compare those systems and does not quote a sample cost.