When the NE of England had its referendum a few years back on the issue of establishing regional parliaments within England (a crackpot idea which the people of the NE rejected) the English district of Berwick gave serious thought to leaving this proposed region and joining Scotland.
Berwick-upon-Tweed was a Scottish city under English occupation at the time of the union of the crowns of England and Scotland and has remained a bit of an oddity. Today it is in England but its football team is considered Scottish. However the district of Berwick is bigger than the city and covers areas that have always been England, for example the seaside town of Seahouses. Yet there seemed to be a fair measure of support for joining Scotland even from here. From the perspective of North Northumberland London seems pretty remote, but Edinburgh is on the doorstep.
More seriously best practice identified by Scotland in any matter should be introduced in England - and vice versa. My view is that we need better systems for doing just this (and also with Wales, NI, Channel Islands, Isle of Man, Gibraltar and perhaps even Ireland). The proposed framework is an umbrella organisation "The Council of the Isles".