Professor McLean has also held a number of appointments, both nationally and internationally. Currently, she is UK Adviser to the European branch of the World Health Organization on the revision of its Health for All policy, a member of the UNESCO Biomedical Ethics Committee, and Specialist Adviser to the House of Commons Science and Technology Select Committee. Between 1997 and 1998, she chaired the Department of Health review of consent provisions in the Human Fertilisation and Embryology Act 1990 and between 2000 and 2003, chaired the Independent Review Group on Organ Retention at Post Mortem. From 1999 to 2002, she was the first Chairman of the Scottish Criminal Cases Review Commission.