English language in southern England
South East England and the Home Counties (the counties bordering London) tend to reflect the interface between the London region and other regional accents. Affluent districts are associated with a modified Received Pronunciation (RP) accent, reflecting their traditional popularity with upper middle and upper-class residents which has spread throughout more social classes broadly in rural areas with commuting access to London. Less affluent areas have traditionally mainstream London accents (that is, variants of the Estuary English accent) that grade into southern rural outside urban areas.
British English
Since the mass internal immigration to Northamptonshire in the 1940s and its position between several major accent regions, it has become a source of various accent developments. In Northampton the older accent has been influenced by overspill Londoners. There is an accent known locally as the Kettering accent, which is a transitional accent between the East Midlands and East Anglian. It is the last southern Midlands accent to use the broad "a" in words like "bath"/"grass" (i.e. barth/grarss). Conversely "crass"/"plastic" use a slender "a". A few miles northwest in Leicestershire the slender "a" becomes more widespread generally. In the town of Corby, north, one can find Corbyite, which unlike the Kettering accent, is largely influenced by the West Scottish accent.