The British Medical Association (BMA) is a registered trade union for doctors in the United Kingdom. The association does not regulate or certify doctors, a responsibility which lies with the General Medical Council. The association's headquarters are in Tavistock Square, London and it has national offices in Cardiff, Belfast, and Edinburgh, a European office in Brussels and a number of offices in English regions. The BMA has a range of representative and scientific committees and is recognised by National Health Service (NHS) employers as the sole contract negotiator for doctors.