Oh, that sounds fascinating. I know a fair bit about how dialects developed within the UK, but not much about where they went from there.

*grins* Lilts are the worst. My grandfather left Wales sixty years ago and I've never lived there, but I still lilt when I'm tired. I also had the interesting experience of being surrounded by a different type of accent at each educational stage (Thames/estuary English at primary school, accentless middle class at Secondary level and posh as can be at uni), so I've picked up all sorts of odd inflections, including some Yorkshire ones from my boyfriend.