We rented a car, and drove up from Newcastle. (Train from London to Newcastle.)
Well worth the trip. The “wall” itself was only the connection between distinct Roman camps and administrative centers at intervals behind the wall. Every camp and “fort” was connected by the road behind the wall, and those roads are still used as the location for today’s paved two-lane roads.
It worked, but like the much longer “wall” in China, it had to be manned, had to be defended. It was not just a single passive barrier magically protected the country behind it.
I visited the other end at Walltown, near Carlisle. Less than 10 feet high through most of the part we saw. I want to get into some kind of shape that’s not “round” and hike the length. I love Northern England.