1. I know the guy at Manchester University who runs the infrastructure for that site
2. That same individual and I had a multi-year argument about the nature of a "teacake", which to me always has raisins in it. To him that's a fruit teacake. This settled the argument: it's just regional variation.
The study did not just look at names for bread. Favourite other highlights:
1. Evening meal names: http://projects.alc.manchester.ac.uk/ukdialectmaps/lexical-v...
2. The game where you knock on a door and run away http://projects.alc.manchester.ac.uk/ukdialectmaps/lexical-v...
3. The (Irish descended) whether "book" and "spook" rhyme: http://projects.alc.manchester.ac.uk/ukdialectmaps/phonologi...
4. Whether "class" and "farce" rhyme (also likely indicates pronunciation of bath, garage, grass, etc.): http://projects.alc.manchester.ac.uk/ukdialectmaps/phonologi...
5. How acceptable sentences that break the rules of grammar are: http://projects.alc.manchester.ac.uk/ukdialectmaps/syntactic...
Definitely encourage people to have a look through some of the menus.