Watling Street: the biggest cultural boundary in England

This video is about why a Roman road along a nationally-significant watershed became the biggest cultural boundary in England. Which is why West Midlands folk talk differently to those in Leicestershire.
Sources
Clive Upton, Stewart Sanderson and John Widdowson ‘Word Maps: A dialect atlas of England’ (Croom Helm 1987)
Sorry, I never kept a note of who researched the parish registers and I’ve never rediscovered the work since, despite searching several times. If you know please email me:- [e-mail]