I have been asked to look at this for you.
It is actually quite a common question.
It really depends on a whole variety of factors including, very often, the age of the house because although nowadays the internal boundary would normally reflect the external boundary and the mythical boundary pencil line would continue as if it were one straight line, in older properties, and particularly terraced houses, the external boundary feature was very often placed anywhere on the ground without worrying too much about how it lined up with the internal boundaries.
If you can let me have a plan with some kind of narrative and a photograph of the old position and the new position, as much detail as possible, I may be able to expand my answer for you.
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
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