The papers consist of:
(1) Subject files of correspondence (and related papers) produced by Lester in the course of his career as a barrister and (principally) as a member of the House of Lords.
(2) House of Lords Written Answers to questions put by Lester: (a) a comprehensive series covering 1993 to 2005 (LESTER/183-LESTER/188); and (b) a scattering throughout the files.
(3) Lester's writings (articles, lectures, letters to the press, speeches, publications etc.): (a) LESTER/205-LESTER/213, a carefully arranged chronological series of nine files, each introduced by the relevant portion of a sequential index numbered 1[18]-335, and covering the period 1964-2011; (b) other individual files of articles, lectures, speeches etc. (e.g. LESTER/215, LESTER/216, LESTER/221, LESTER/222, LESTER/223; (c) other occasional examples of papers, articles, notes, and annotated documents scattered throughout the subject files.
The papers reflect Lester's senior role with the Social Democratic Party (SDP) and the Liberal Democrats, his campaigning political interest in Human Rights both in the UK and internationally, race relations, equality legislation, constitutional matters, European Union policy, religious discrimination, free speech/freedom of expression, freedom of information, asylum, civil partnerships, racism and antisemitism, Northern Ireland human rights matters and family planning, law reform and reform of the justiciary, equality for women, forced marriages, Holocaust reparations, prison reform, scrutiny of treaties, defamation, and the invasion of Iraq; his prolific output as an author of publications, articles, lectures, speeches and letters to the press; his membership of Lincoln's Inn and the Garrick Club; and personal and professional contacts with his many correspondents in politics, the legal profession and the press.
Lester's Private Member’s Bills and political campaigning helped bring about the Human Rights Act 1998, the Civil Partnership Act 2004, the Forced Marriage (Civil Protection) Act 2007, the Constitutional Reform and Governance Act 2010, the Equality Act 2010, and the Defamation Act 2013: the papers reflect many of the issues which resulted in the enactment of these pieces of legislation.