Consists mainly of letters to Robert Spence Watson. Topics include, but are not limited to, British politics and the Liberal party, contemporary Europe, Armstrong College (later Newcastle University), the Peace Society, lectures at the Literary and Philosophical Society of Newcastle upon Tyne, and contemporary literary and scientific achievements. Other regular recipients of letters include Elizabeth Spence Watson, Frederick Weiss, and Charles Prestwich Scott.

The Spence Watson's wide-ranging public activism, make their correspondence a valuable source of opinions on the social and political matters of the day from a wide range of prominent persons.

The archive mainly comprises correspondence relating to Charles' activities as a Civil Servant and administrator. There are also publications relating to these activities and Charles' wider interests.

There is also personal content, including travel diaries, family correspondence and papers regarding inheritance of the Wallington estate in Northumberland.

This archive includes content accumulated and created by both Charles and Mary, and other family members. It reflects the family's personal activities from Charles' childhood in the 1870s to Mary's death in 1966, but also includes some content from Charles' professional life. It can support research into a broad variety of areas, including political history (particularly the Liberal and Labour parties, socialism and international relations), World War I (particularly dissent and the peace movement), childhood and education (from both a personal and political perspective), domesticity, class and landed estates.
This extensive personal archive is mostly comprised of correspondence. This includes: Correspondence to Charles in his role as MP Correspondence to and from Charles relating to the operation of the Union of Democratic Control Correspondence to and from Charles relating to his positions in government Correspondence relating to the management of the Wallington estate and the donation to the National Trust Correspondence between members of the Trevelyan and Bell families, much of which is domestic in tone Correspondence to and from Charles and Mary's children from their early childhood to adulthood Correspondence from visits abroad including North America, Australia, New Zealand, the Middle East, Russia and Germany The correspondents include family members such as Charles' brothers George Macaulay Trevelyan and Robert Calverley Trevelyan, Mary's sister and brother in law Elsa Richmond and Admiral Sir Herbert William Richmond. Other correspondents include Sir Winston Churchill, J Ramsay MacDonald, E D Morel, Arthur Ponsonby, Walter Runciman, Herbert Samuel, George Bernard Shaw and Jennie Lee.

Other documents include: Papers relating to Charles, Mary and their childrens' educations, including exam papers and school ephemera Personal Diaries, in particular a short run of Mary's personal diaries as a young woman Official political papers, including Cabinet Conclusions, draft bills[?] and copies of Hansard Pamphlets and leaflets written by and collected by Charles, many relating to socialism and the UDC Transcripts of speeches given by Charles and Mary in professional and personal capacities Personal notebooks with draft speeches and essays Family photograph albums and glass negatives, recording family events, daily life, and Charles' political career Press cuttings and scrapbooks relating to family events and Charles' career

Comprising most of family correspondence, with some content relating to estate and property and George Otto Trevelyan's political career. Also includes autographs and cuttings of notable figures.

The archive comprises mainly correspondence addressed to Sir Walter and his first wife Pauline Lady Trevelyan nee Paulina Jermyn. The letters reflect the couple's interests in natural history, botany, geology, antiquities, travel, temperance, phrenology, art and literature, and include examples from many well known contemporaries.

There is also material relating to the history of the Trevelyan family, accumulated during Walter and Charles Edward Trevelyan's preparation of 'The Trevelyan Papers' for publication.

The archive also features diaries and journals, sketchbooks, notes for speeches and scrapbooks. There is material relating to the North East of England, including proposed railways, Tyne crossings at Hexham and decoration of the Great Hall at Wallington.

Administration, correspondence, research and campaign materials produced by the Tyneside Campaign for Homosexual Equality, and associated material relating to lesbian and gay politics from the 1970s to the 1990s, including newspaper cuttings, campaign material, leaflets, and magazines and journals.Administration, correspondence, research and campaign materials produced by the Tyneside Campaign for Homosexual Equality, and associated material relating to lesbian and gay politics from the 1970s to the 1990s, including newspaper cuttings, campaign material, leaflets, and magazines and journals.

The White Collection, named after Robert White (1802-1874) was presented to King's College (now Newcastle University) by his great nephew George White Pickering. It is a rich source of literature as well as being strong in ecclesiastical and local history such as James Raine's writings on local history and antiquities.

There are works by John Dryden, William Hazlitt, Thomas Hood, James Thomson, Robert Burns, Mark Akenside, Thomas Chatterton, John Gay, H.W. Longfellow, Matthew Prior, John Keats, John Milton, James Hogg, John Clare, Edgar Allan Poe, George Herbert, William Cowper, Thomas Gray and the poems of Ossian as well as several works by S.T. Coleridge, including Aids to reflection (1848), Biographia literaria (1817), Confessions of an inquiring spirit (1849) and The friend (1850). Alongside the work of these distinguished authors sit English and Scottish ballads, garlands and chapbooks including some which were printed in Newcastle.

Papers primarily relate to Wilcox's time in Germany and Russian and mainly consist of typescripts (some annotated/edited) and offprints of articles published in contemporary journals. These include, for example, versions of a series of articles on Kerensky and Korniloff from the Fortnightly Review (September 1918-January 1919) and the subject's response. There is also a large collection of foreign-language articles and pamphlets (some by Wilcox), including B.V. Savinkov's Za rodinu i svobodu (Warsaw, 1920). Also included is a series of typed primary sources (speeches/statements), primarily relating to the Kerensku-Korniloff affair. There is some correspondence, most significantly a series of letters from Edmund Clerihew Bentley written from the Daily News and, later, the Daily Telegraph (1908-1923). Bentley was a journalist, author of Trent's Last Case, and inventor of the clerihew poem, and remained in contact with Wilcox for many years, although there are no extant letters later than 1923. Also included are a number of letters from Irene Ward, MP, and a small collection of family correspondence. Papers also include collections relating to Wilcox's personal and family life. These include a large collection of photographs, a small collection of articles and pamphlets in areas of interest and bills and receipts relating to the last years of Wilcox's life in Newcastle upon Tyne.