Welcome to the London Borough of BRENT in central Middlesex
It was incorporated in 1965 by bringing together the Middlesex Boroughs of Wembley and Willesden.
The River Brent is the only river wholly in the County of Middlesex and was the original boundary between Wembley and Willesden Boroughs
Other links that will be of use to you:
Middlesex – British History Online
GENUKI – Genealogy – Middlesex
The Association of British Counties