It doesn't really work like that, some people have access to more than one high streets and some aren't in walking distance from any high street. You could pro

It doesn't really work like that, some people have access to more than one high streets and some aren't in walking distance from any high street. You could probably pull records like alcohol licensing or food hygiene certificates to identify all streets with a certain number of shops, then use Google Street View to refine the criteria. Eg if a street is mostly residential on the ground floor, adding some shops doesn't make it a high street imo.