Original poster: melusin_79
Below is our fledgling Brit List. We're aiming for a broad spectrum - culture, history, geography etc. as well as language, expressions, regional dialects - anything, really, that will help you write in the Potterverse.
Future contributions will be linked to this list.
All suggestions are welcome.
Example Phrases and Vocabulary:
British and American word usage
So far we have the following volunteers for specific regional questions:
darkheartwalsh North of England, especially Lancashire and Cumbria.
hope_24 Scottish, Glaswegian and general Scots slang and culture.
melusin_79 Basic Welsh, South Wales English. South Wales and West Wales culture.
persevero North of England, Lancashire, Cheshire, West Derbyshire.
camillo1978 South West England, Devon etc
Class and the Potterverse
OTHER USEFUL SOURCES:
Dictionary of English Slang and colloquialisms: http://www.peevish.co.uk/slang
Language Reference Guide For British English: http://www.translationdirectory
Mrs Muggle's Potterwords. Invaluable for quick canon references - used by most of the moderated archives as such: potterwords
Villages in England: http://en.wikipedia.org/wiki
Towns in England: http://en.wikipedia.org/wiki
Traditional English Names: http://www.behindthename.com