Diana Guy was born in March 1943 according to company records. She studied law at Lady Margaret Hall, University of Oxford, entering in 1962. Her professional career developed in London during the expansion of European legal practice surrounding the European Economic Community and the increasing use of competition law in merger and market investigations.
Guy studied law at Lady Margaret Hall, University of Oxford, where she entered in 1962. She obtained a Bachelor of Arts in law and later held a Master of Arts in jurisprudence. Lady Margaret Hall, founded in 1878 as Oxford's first college for women, provided the institutional setting for her legal education during a period when women were becoming more prominent in the British legal profession.
Guy was admitted as an English solicitor in 1968. She joined Theodore Goddard, a City of London law firm, becoming a partner in 1973 and later a consultant. Her practice concentrated on European Community law, competition law, and related intellectual-property matters; she was involved in cases before the Monopolies and Mergers Commission and the European Commission, and served for about a decade as legal adviser to Airport Co-ordination. In 2001 Guy became a member of the Competition Commission, the UK body responsible for investigating competition concerns in mergers and markets. She was appointed Deputy Chairman in 2004 and held that position until 2010. She chaired inquiry groups concerning mergers and market investigations, including the Carlton-Granada ITV merger, Ardagh International Holdings' acquisition of Redfearn Glass, local bus services, and the review of ITV's Contract Rights Renewal arrangements. In parliamentary evidence in 2010, she explained the Commission's approach to competition and public-interest issues in television advertising. Guy also served as a non-executive director of Catlin Underwriting Agencies and Catlin Insurance Company (UK).
Served as Deputy Chairman of the UK Competition Commission from 2004 to 2010 after joining the Commission as a member in 2001.
Chaired Competition Commission inquiry groups examining major mergers and market investigations, including the Carlton-Granada ITV merger, the Redfearn Glass acquisition, local bus services, and ITV's Contract Rights Renewal arrangements.
Developed a legal practice specializing in European Community law, competition law, and related intellectual-property issues.
(An article by Diana Guy in the Yearbook of European Law s...)
1988(A co-authored article by Diana Guy and F. O. W. Vogelaar ...)
1973(A book by Diana Guy and Guy F. Leigh on intellectual-prop...)
1981Guy participated in professional legal organizations connected with European and competition law. She was President of the Law Society's European Group and a member of the City of London Solicitors' Company and its Competition Law Sub-Committee. These bodies provided professional forums for solicitors and for the study and practice of European and competition law.
