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See this excellent blog for language news of the week, maintained by a teacher of A Level English Language.
Other useful links are collected here.
As well as the body of ‘genderlect’ research, you also need to be able to discuss the gender aspects of the studies you’ve looked at for this unit. The key ideas here are:
Lexis varies between age groups:
Older people more likely to use traditional dialects
Younger people more likely to speak Estuary or other combined varieties (e.g. “posh Geordie”)