This thesis investigates the supposedly new variety of English, Estuary English (EE). It discusses how changes in British society influence the language in general and how these sociolinguistic correlations are relevant for EE in particular. Various definitions of and claims about EE are presented and discussed. As a result, conclusion is reached that EE may be defined as a phonetic continuum between less stigmatised London features and Innovative RP features spoken by many speakers of various social classes in an increasingly large area of England spreading from London towards the Home Counties. This definition, alongside the previously made claims about the phonetic constituents of EE, is the basis for our description of the phonological features within the EE continuum. The hypothesis about the spread of the EE features to the Home Counties is tested. Four phonological variables (two consonantal (t) and (l) and two vowel (aU) and (@U)) are singled out for the sociophonetic investigation of their occurrence in one of the Home Counties, Surrey. Correlations between these variables and social factors central for EE (those of class and gender) are first measured quantitatively and further tested for statistical significance. Our results are compared with other research on EE as well as with the phonetic research (the Survey of English Dialects) conducted in the same area fifty years prior to our investigation, in order to test the hypothesis about the innovative character of EE. Generally speaking, phonological features associated with EE are present in our survey material. At the same time, their correlation with the social factors varies from feature to feature to such an extent that we cannot confirm that the continuum is a uniform sociophonetic variety in the Home Counties.