Shouldn't the line in the UK be further north, closer to the Iapetus Suture? IIRC that's the collision of northern and southern parts of Great Britain, and the

Shouldn't the line in the UK be further north, closer to the Iapetus Suture? IIRC that's the collision of northern and southern parts of Great Britain, and the geological differences translated to modern cultural differences, and consequentially the Scottish-English border is roughly close to it too. The wikipedia page also mentions the Caledonian orogeny. > The Caledonian orogeny united the northern and southern portions of present-day Great Britain. The Iapetus Suture runs from the Solway Firth to Lindisfarne. The Anglo-Scottish border runs near and roughly parallel to the suture. https://en.wikipedia.org/wiki/Iapetus_Suture https://en.wikipedia.org/wiki/Iapetus_Suture