OCR is based in Cambridge, with an office in Coventry. It is part of the University of Cambridge's Cambridge Assessment, which operates in over 160 countries and celebrated its 160th anniversary in 2018. OCR delivers GCSE and A Level examinations in the United Kingdom whereas for other countries Cambridge Assessment operates the examination board Cambridge International Examinations (CIE). An important distinction between OCR and CIE is that the British exam board OCR is required to comply with UK government regulations and CIE with international GCSEs and GCE A Levels is not.