I am a historical sociolinguist.  My work is based on the history of London language.  I have a long-term interest in the specific kind of codeswitching between Medieval Latin, Anglo-Norman French and Middle English visible in accounts and inventories: in particular, late fourteenth to mid-fifteenth century changes in ratios, morphology and syntax.  I am currently preparing a volume with 21 colleagues on how this kind of multilingual situation resulted in the development of Standard English.  My monograph on house names (in press) also considers the influence of Scottish Gaelic and Old Norse, the effects of communities of practice (notably, North British farmers, Nonconformist Christianity), and fashion (notably, the glamour of early 14th century knights resulting in the long-lasting fashion for pubs named after the emblems of heraldry such as the Red Lion).