In Pictures: Unique areas at risk
Sugar House Lane, Newham, has been under development pressure for some years as the small factories and workshops that characterise it have closed and buildings have been bought by developers.
Due to Crossrail, Denman St has a high level of vacancy and blight. English Heritage is concerned that Crossrail could have a significant impact upon this conservation area.
Harmandsworth is a medieval settlement, originally set in open countryside and farmland but this conservation area is now risk because of the proposed third runway at Heathrow.
Noel Park in Haringey was designated a conservation area in 1983, but the estate has suffered from extensive piecemeal alteration which has eroded its character and raised concerns from local residents.
By contrast, English Heritage has praised Kings Cross for its development of the Regent's Quarter that has transformed a derelict part of the Kings Cross conservation area into a vibrant new district.
The Webb Estate in Croydon, which was designated a conservation area in 1983, has also been praised by English Heritage for being an example of a well managed conservation area.
Wanstead Grove in Redbridge was designated a conservation area in March 2009 because local residents hope that this will make it easier to raise its profile and to manage future change in the area.