I have just come across the following website, which has useful information about dialects in the UK - MacKenzie, Laurel, George Bailey & Danielle Turton. 2016. Our Dialects: Mapping variation in English in the UK [Website]. http://tiny.cc/OurDialects. I found it at http://projects.alc.manchester.ac.uk/ukdialectmaps/
I was interested to see that "batch" is used for a bread roll not only in my birthplace of Coventry but also Liverpool. It seems surprising that two cities that are quite separate should use the same word but I suppose there must have been some common origin.