Canvey Island the 30 hectares known as West Canvey marshes, acquired by the RSPB in 2007, and the Canvey Wick nature reserve. Canvey Wick is a designated Site of Special Scientific Interest (SSSI) at the site of the abandoned and incomplete oil refinery. The foundations of the 100 hectare (0.4 sq mile) site were prepared in the 1970s by laying thousands of tonnes of silt dredged from the Thames; the abandoned and undisturbed area has flourished as a haven for around 1,300 species of wildlife, many of which are endangered or were thought to be extinct; including the shrill carder bee, the
Estuary English various rates "socially" into middle-class speech and "geographically" into other accents of southeastern England. The scholar Alan Cruttenden uses the term London Regional General British in preference to the popular term 'Estuary English'. The names listed above may be abbreviated: Some authors use different names for EE closer to Cockney (Popular London) and EE closer to Received Pronunciation (London Regional Standard or South-Eastern Regional Standard). Note that some other authors use the name Popular London to refer to Cockney itself. The boundary between Estuary English and Cockney is far from clearcut. Several writers have argued that Estuary English is not