Chalfont St Peter:
Road: M25 between J16 and J17
Location: Chalfont St Peter, Buckinghamshire
Other names: Warren Farm
Date planned: 1998
Grid reference: TQ018900
See also: Iver
Google Maps link
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Very little is known about these services, other than that it was an attempt to address the lack of services to the west of London, but Beaconsfield and Cobham were later chosen instead.
There would have been services on either side of the busy motorway.