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Join the Rootsweb Middlesex Mailing List
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Rootsweb Middlesex Message Board
British Genealogy Forums
Has Forums for both London and Middlesex.
Curious Fox
The village by village contact site for anybody researching family history, genealogy and local history in the UK and Ireland.
Rootschat (London & Middx)
Another popular genealogical Forum.
Ancestryaid
Family Tree Forum
Cousin Connect
Genealogy Specialists