If you have roots in England or Wales, you likely have a relative who lived, died, and was buried in London. It is a challenge, as each churchyard, burial ground,cemetery and crematorium kept its own records. There are several online sites to visit but if you Google, GENUKI, this is a directory of cemeteries and crematories in the UK. It is organized by the Cemetery Research Group and is the first directory of its kind in the UK. It covers local areas in England, Scotland, Wales and Northern Ireland,and each site lists owners. Also, local authorities, parish and towns, community councils, religious denominations and private sector companies are provided when available.
For further reading, Internet Genealogy, December/January 2010 issue offers an excellent review of web sites about the subject.