The archive of the Merseyside Unity Theatre was acquired in 1987 by the Regional History Department and some items were subsequently put on display in the Museum of Labour History. As a result of an internal reorganisation, care of the collection passed to the Department of Archives in 1992.
Further additions were made in 1991 and 1992, and these have been added to the list.
When the original list was prepared a series of notes were included, to provide a background to the material. These have now been put at the end of the catalogue.