The British Chiropractic Association (BCA), founded in 1925, represents over 50% of UK Chiropractors.

 All BCA chiropractors will have undergone a minimum four-year full-time internationally-accredited undergraduate course and are registered with the General Chiropractic Council, the UK's statutory regulator for the profession. The BCA aim to promote, encourage and maintain high standards of conduct, practice, education and training within the profession in the UK.
 

British Chiropractic Association site.