Mercedes Durham is Senior Lecturer in Sociolinguistics at Cardiff University, UK. Her research includes work on the acquisition of sociolinguistic competence, and Welsh and Scottish dialects of English. Jonathan Morris is Coleg Cymraeg Cenedlaethol Lecturer in Linguistics and Applied Linguistics at the School of Welsh, Cardiff University, UK. His research focuses on sociolinguistic aspects of bilingualism and second language acquisition in the Welsh context.