And a lot of the boundary features predate accurate mapping. It could be a 500 year old ditch with a hedge planted on one side that is cut back every year. To

And a lot of the boundary features predate accurate mapping. It could be a 500 year old ditch with a hedge planted on one side that is cut back every year. To draw a line hou would have to make an arbitrary decision that ignores the practicalities of hedges and ditches. Also being able to locate things to a global reference system is a very new thing. Before GPS everything had to be measured relative to something else on the ground. That was never perfectly accurate and could have absolute errors of a few metres.