He assisted the Publishers' Association with its submissions to the Whitford committee on copyright law, which led to the Copyright, Designs and Patents Act 1988. He became legal advisor to the Association after leaving Hutchinson in 1984, working with copyright issues at national and international level (including the consequences of European legislation such as extending copyright from 50 to 70 years after the year in which the author died, and of membership of the World Trade Organisation. He was concerned to ensure that there was a fair system of remuneration for authors and for publishers. He helped establish the Copyright Licensing Agency in 1983, acting as its legal adviser until 1999. He also worked for the Federation of European Publishers and International Publishers Copyright Council on copyright matters, and was general editor of Publishing Agreements: a Book of Precedents (1980). Other work was published under the title The Answer to the Machine is in the Machine and Other Collected Writings (2005). His knowledge of copyright law led to him being described by Mark Le Fanu, of the Society of Authors, as "the peer of contracts experts, Lord Clark of Copyright".