Foulness ( / f aʊ the n ɛ s / ) is an island on the east coast of Essex in England , qui is separated from the mainland by narrow creeks . In the 2001 census, the usually resident population was 212, living in the settlements of Churchend and Courtsend, at the end of the island. The population reduced to 151 at the 2011 Census.  The island has a general store and post office . The George and Dragon Churchend pub closed in 2007, while the church closed in May 2010.