The British Library in London (in the person of a linguist, Jonnie Robinson, who is about to become their 'Curator of Sociolinguistics and Education') has just launched a wonderful website.
This includes a clickable map of the whole UK (not just England) that takes you to annotated and transcribed audio files for the accents concerned and which
even gives a choice of date for the recordings - 1950s or 1990s. It also allows school and university students to upload recordings of their own accent for the archives. Those of you in other countries may find it helpful in your own teaching, but of course it's of most immediate relevance inside the UK.
Hinweis meiner Kollegin Dr. Claudia Bubel