192 - Electoral Register & Phone Directory
This site allows you to search the UK for people by name who are listed on the electoral register or in the phone directory, and is thus ideal if you are looking for possible relatives in a given area with a comparatively unusual surname.
The site also includes other directory facilities and a very useful map facility.
There is a useful guide to tracing relatives at www.192.com/content/help/trace-relatives-guide
In addition the British Telecom Directory can be accessed at www.bt.com
Page updated July 2009 - link to relatives guide