www.hmc.gov.uk/archon/archon.htm The principal information website and "gateway" for UK archivists, and users of manuscript sources for British history.
It is hosted and maintained by the Historical Manuscripts Commission, and can be accessed through their website homepage as well. From here you can get information on any record office, archive or repository in the United Kingdom and access their website, if they have one. This useful website includes links to some overseas archives too.
For on-line descriptions and catalogues of archive collections held by UK archives:
Access to Archives www.a2a.pro.gov.uk
Archives Hub www.archiveshub.ac.uk - collection-level descriptions of archives held at universities and colleges in the United Kingdom
Film and television archives:
Researchers' Guide On-line to film, television, radio and related documentation collections in the United Kingdom and Ireland: www.bufvc.ac.uk/databases/rgo.html
Film Archive Forum:
www.bufvc.ac.uk/faf
National Film and Television Archive (British Film Institute): www.bfi.org.uk/collections
The Bill Douglas Centre for the History of Cinema and Popular Culture www.ex.ac.uk/bill.douglas
Television South West Film and TV Archive at Plymouth, Devon: www.tswfta.co.uk
Wessex Film and Sound Archive: www.hants.gov.uk/record-office/film/index.html
www.english-heritage.org.uk
Navigate to Education and the Local Studies to find the National Monuments Records.
www.bt.com/index.jsp The BT UK telephone directory on-line
www.infobel.com/teldir Internaional directories and lots of other telephone directories including business pages
Information on the Devon and Cornwall Record Society is at: www.cs.ncl.ac.uk/genuki/DEV/DevonCRS.html
A shelflist of the Society's collections, held in the Westcountry Studies Library, is at:
www3.devon.gov.uk/local_studies.htm
Information on the Devon and Exeter Institution Library:
www.ex.ac.uk/library/devonex.html
Local history and heritage organisations in Devon are listed at: www.devon.gov.uk/eal/comminfo/asp/organisation/subjects1.asp - click on 'Heritage'
Local History Groups in UK: www.local-history.co.uk/Groups