 This is when the -th- is pronounced as [f] or [v]” (Kerswill, 2003).The following are the 13 most reported dialect features in the metropolitan regions of Blackburn, Birmingham, Cardiff, Nottingham, Glasgow, London, Liverpool, Manchester, Newcastle, Preston, Sheffield, Teesside, Coventry, Swansea, Brighton, Leeds, and Bristol, according to "The Survey of British Dialect Grammar".Estuary English is a new English variation found on the Thames Estuary.