The following sources may assist in locating serials for requests.
ABTAPL - Theological and Philosphical Libraries
ARLIS - art, architecture and design periodicals plus a Directory of Art Libraries in the UK and Ireland
British Library - all online catalogues
COPAC - search over 70 UK and Irish academic, national & specialist library catalogues
Directory of Open Access Journals - a 'one-stop shop' for scholarly and scientific journals
Early Journals: Internet library of early journals - digital library of 18th and 19th Century journals
Evidence in Health and Social Care - NHS England, journals and databases
Find Electronic Journals (British Library)
HighWire (Stanford University) - free online full-text articles
SALSER - serials catalogue for Scottish academic and research libraries
UK PubMed Central - a free information resource for biomedical and health researchers
SearchM25 -M25 consortium of academic libraries
WorldCat - 'the world's largest library catalogue'