 Between 1999 and 2001, he was a Fellow of the Institute of Directors.Between 1988 and 2005, Lord Colwyn was President of the Natural Medicines Society, between 1991 and 1998 of the Huntington's Disease Association and between 1993 and 1998 of the Society for Advancement of Anaesthesia in Dentistry.He was further President of the Arterial Health Foundation from 1993 to 2004, of the Metropolitan Branch of the British Dental Association (BDA) in 1994 and 1995, and finally Council Member of the Medical Protection Society from 1994 to 2001.