From the longer Wikipedia page [1]
Purfleet-on-Thames is a town in the Thurrock unitary authority, Essex, England. It is bordered by the A13 road to the north and the River Thames to the south and is within the easternmost part of the M25 motorway but just outside the Greater London boundary. It was within the traditional Church of England parish of West Thurrock. Some industry is located to the south and the area forms part of the Thames Gateway redevelopment area. Purfleet is one of seven conservation areas in Thurrock.