SELT Test providers website details:
Trinity College
London Website: www.trinitycollege.com/SELT - Test Centres: www.trinitycollege.com/findaseltcentre
IELTS SELT
Consortium
Website: www.ielts.org - Test Centres: www.ielts.org/book-a-test/find-a-test-location
LanguageCert
Website: www.Languagecert.org/selt - Test Centres: www.Languagecert.org/selt-locations
Pearson Education
Ltd
Website: www.pearsonpte.com - Test Centres: www.pearsonpte.com/locations