or estuary English
a spoken variety of English influenced by cockney, London speech, and Received Pronunciation, used in London and southeastern England in the area of the Thames estuary.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a variety of standard British English in which the pronunciation reflects various features characteristic of London and the Southeast of England
Word Origin for estuary English
C20: from the area around the Thames estuary where it originated
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012