Notice in the map the Romans stopped when they got to Scotland. The Roman Emperor Hadrian got tired of having his troops in England constantly having to battle the Scots when they made incursions and had a wall built which was called Hadrian’s Wall and the remnants of which are still the dividing line between England and Scotland today. Walls work!
From that map though, it looks like they got a bit up into Scotland. A fair part of the South. There is Hadrian’s wall and my friends tell me, there is a 2nd wall as well. I’ve seen Hadrian’s, beautiful scenery around it.
The history of the Roman empire in what is now the UK is utterly fascinating. We were just discussing some other story on it a few months ago.
:)