Gillies returned to the United Kingdom and trained in general practice, gaining his Membership of the Royal College of General Practitioners (MRCGP) in 1985.[3] From 1985 he worked as a GP principal in Glenluce, Wigtownshire.[3] He then moved to Selkirk in the Scottish Borders in 1996 where he worked for the 16 years in until he retired from clinical practise in 2012.[2] During the latter part of this time he was working as a GP trainer.[3]
Academic GP
Gillies was a Honorary Senior Lecturer at the University of Edinburgh.[3] He was one of the authors of Distilling the Essence of General Practice which looked at the important and unique advantages of general practice and the development of primary care throughout the UK.[4] He was involved with education initiatives in Africa.[5][6] He is an associate member of the University of Edinburgh's Global Health Academy.[7] Gillies was on the members advisory board of the Wesleyan Assurance Society.[8] He was chair of the Reference Group of the Scottish Government Health Department's Out of Hours Primary Care Review that reported in 2015.[9] He chaired a group that looked into undergraduate medical education in Scotland that reported in 2019.[10]
Gilles was involved with an initiative that presented a book of poems Tools of the Trade to every newly qualified doctor in Scotland.[11][12]
RCGP Scotland chair
Gilles was elected by the members of RCGP's Scottish Council to be chair, taking up the position in November 2010. His priorities as chair were to promote generalism and leadership in general practice.[13] He took up the chairmanship when integration of health and social care was progressing in Scotland, while legislation enacted in England saw a focus on competition.[14] During his time as chair of RCGP's Scottish council he spoke out about health inequalities[15] and about the support needed for GP practices to improve quality.[16] In October 2013 he travelled to the Western Isles to unveil a memorial to a dedicated family of doctors.[17] In November 2013 his chairmanship was extended for another year. He delivered a petition to the office of First Minister, signed by 21,000 Scots calling for further resources to be put towards general practice.[18] He was succeeded by Miles Mack in November 2014.[19]