The Assessment and Qualifications Alliance

AQA is the UK's leading awarding body for general qualifications.
www.aqa.org.uk

Edexcel

Edexcel is the leading provider of internationally recognised qualifications.
www.edexcel.org.uk

Oxford Cambridge and RSA Examinations

OCR is the leading UK awarding body, providing a wide range of qualifications to meet the needs of learners of all ages and abilities.
www.ocr.org.uk

Eduqas

Part of WJEC, providing qualifications that inspire learners and enhance student achievement.

http://www.eduqas.co.uk/