sandyRoe, after a quick look at google, I’ve found one reference to miners being prevented from travelling – but that wasn’t a law - it was a guideline for Kent police. This from the Mirror:
//One official guideline said it was “perfectly in order” for miners in Kent to be prevented from travelling to Yorkshire if they were likely to cause disorder – a 300-mile exclusion zone.
It was a form of house arrest and it happened in many places with pickets turned back at county borders.//
http://www.mirror.co.uk/news/uk-news/margaret-thatcher-dead-authoritarian-ruler-1821699
It cannot have been, as the report claims, a form of ‘house arrest’ if people deemed likely to cause affray were turned back at county borders – but that’s biased reporting for you.