InforM25 consists of four integrated services:

Find a library contains general information about M25 Consortium institutions and associated site libraries.
Using Libraries in the M25 Consortium provides details of how to visit M25 Consortium libraries including the Visit a library online tool that gives guidance on which libraries you can visit and what you can do when you get there.
Search catalogues can be used to find books, journals and other material in over 45 academic libraries.
New Development - For Subject and Keyword searches you can also find relevant archive collections
Union List of Serials (ULS) holds data on periodicals in the libraries of the University of London, Imperial College London and the University of Westminster.