This (great) from William Byrne (03.04):

In response to your question regarding regional accents, I thought that you might be interested in the British Library collection of English Accents and Dialects which has recently found its way on-line at the following address:

http://www.collectbritain.co.uk/collections/dialects/

I'm not sure if this will assist you in exactly identifying accents,but I hope that it proves a somewhat valuable resource. It's certainly fun to browse.