Some services are available to non-UK, European institutions.
It lists the material held in the major Reference and Document Supply collections of the British Library. A searchable form allows many combinations to find books, conference proceedings, working papers and so forth. If you are uncertain of the title or ISBN for a book, then look it up here. Search for a book or periodical by author, keyword, year and so forth. This seems a good service to be able to search for related books and articles, check specific details, or to learn of other material by authors already known to you.