YLEUK is one of many organisations within the English language world. Apart from YLEUK, these are the most important organisations you should know about:
All members of YLEUK are accredited by the British Council’s accreditation scheme which aims to assess standards and practices; not just in teaching but also in student welfare advertising and the management of courses.
English UK is the trade organisation for accredited language schools in the UK
Trinity College provides the GESE exams provided by many language schools