As advocate He was admitted to the
Faculty of Advocates in 1967 and appointed
Queen's Counsel in 1981. He was called to the
English Bar (
Lincoln's Inn) in 1991. Gill was an
Advocate Depute from 1977 to 1979, and standing Junior Counsel to the
Foreign and Commonwealth Office (1974–77), the
Home Office (1979–81) and the
Scottish Education Department (1979–81). He has been a member of the
Scottish Legal Aid Board and the Scottish Valuation Advisory Council and Deputy Chairman of the
Copyright Tribunal. From 1987 to 1994 he was Keeper of the
Advocates' Library and a Trustee of the
National Library of Scotland.
As Judge First instance judge and Chairman of the Scottish Law Commission 1996 - 2001 Gill was appointed a
Senator of the College of Justice in 1994, and took the title Lord Gill. He was Chairman of the
Scottish Law Commission from 1996 until 2001. In this capacity he was directly responsible for reorganising the production of wide-ranging legal studies and reports, legislative programmes and completion of projects outstanding from before his appointment. These are contained in the Fifth Programme of Law Reform of 25 February 1997 and the Sixth Programme of Law Reform of March 2000. The Fifth Programme declared itself to be "a new programme of law reform, which will consolidate and supersede all previous programmes." The new programme included the setting of anticipated realistic targets for project completion and the institution of a cycle of rolling programmes, reported on and revised at 3-5 year intervals. The Sixth Programme recorded that the aims and projects of the Fifth Programme had been substantially achieved, alongside completion of various non-programme projects intervening. New priorities were for the introduction of timetabling and management planning. Ministerial references were anticipated and were to be given in each case a specific completion date.
Lord Justice Clerk 2001 - 2012 Lord Gill was appointed
Lord Justice Clerk and President of the Second Division of the Inner House of the
Court of Session in November 2001. Instead, the panel recommended another candidate,
Lord Hamilton, who was duly appointed on 2 December 2005. Within a short time of the appointment, Lord Hamilton was admitted to the
Priory Hospital in Glasgow. By 13 June 2006 the
Senior Judiciary (Vacancies and Incapacity) (Scotland) Act 2006 was introduced in Bill form so as to enable the Lord President's functions to be passed to the Lord Justice Clerk so that business of the Lord President could be transacted in any further periods of absence. Lord Hamilton's return to work averted an activation of the statutory provisions. On 11 May 2004 a disastrous
explosion at the Stocklines plastics factory in Glasgow occurred. Lord Gill conducted a public inquiry into the accident. He was appointed on 21 January 2008 and reported in July 2009. He was tasked to ascertain the likely causes of the event and to make recommendations to avoid a recurrence elsewhere. He proposed a new safety regime for
liquefied petroleum gas (LPG) installations. The Health and Safety Executive duly incorporated these recommendations and findings into the new safety regime consultations.
Lord President 2012 - 2015 In June 2012 Lord Gill again applied for the position of Lord President, and was appointed. The nomination to
the Queen was made by
First Minister Alex Salmond who described him as "of great stature and integrity". He was the first Roman Catholic to be appointed to the position of Lord President. Lord Gill retired in May 2015.
The Supreme Court of the United Kingdom 2015 - 2017 Since then he has sat on occasion as an acting judge of the
United Kingdom Supreme Court. He retired from service on the UK Supreme Court shortly before his 75th birthday. In his farewell remarks,
Lord Neuberger, the then President of the UK Supreme Court, praised Lord Gill's judgments as "models of authority, conciseness and lucidity" and recorded thanks for Lord Gill's "enormous and long-lasting contribution to the development of the law and the rule of law in Scotland and the UK generally."
After the Bench Between September 2017 and September 2020 Lord Gill served as a Judicial Commissioner with the Investigatory Powers Commissioner's Office (IPCO) in the exercise of its functions under the
Investigatory Powers Act 2016. == Reforms to the Scottish Courts system ==