The bulk of the Chapel's records date from the nineteenth and twentieth centuries although there are a number of items from the seventeenth and eighteenth centuries, including the classis minute book, 1654-60. The records cover the foundation, administration and functions of the Chapel and its associated organisations, including the Provident Friendly Society, Historical Society, Sunday School and Day Schools. There is a large series of portraits, prints and photographs of Chapel ministers and prominent persons associated with the Chapel since the seventeenth century.
The remnants of the Chapel's library can also be found in the collection. This includes a number of significant seventeenth and eighteenth century imprints.
The personal papers of John Crosby Warren (d 1931), a prominent member of the congregation and Warden of the Chapel, also feature. They include correspondence, draft articles and lectures, and material collected by him relating to the history of the Chapel.
A number of accruals have been received from the Chapel which are, as yet, uncatalogued.