Boundary

[marlyparly]

How do I establish my boundary line correctly.

You can get a copy of your deeds from the land registry. If you have a copy from when you purchased with a plan, it should have inward facing T marks indicating which side you are responsible for.

You can get a copy of your deeds from Land registry. However they are not always highly accurate so if there are any discrepancies it is best to discuss with your neighbour to agree the line.

Though not all plans show these ‘T’ symbols.

No, not all plans show the T marks. Some deeds are silent but that would be my first port of call.

We had an awful boundary dispute with a neighbour, and learned that on many deeds the boundary line seems to only be indicative. What boundary have you got now OP? How is it currently marked on your property?

Boundaries on deeds are only indicative due to the small scale of the plans. If scaled off the drawing, the actual boundary line itself is so thick it could cover a couple of metres of ground in real life.
Sometimes it is obvious - a boundary line continues from a wall, or the mid-point of attached properties etc. Other times, what appears to exist in real life seems to be a close reflection of what appears on the plan.
If there appears to be a deviation from what is on the plan and no agreement exists between neighbours you may need to investigate the possibility of employing a boundary surveyor but this can be very expensive.

Due to the scale of the OS maps used by the LR, there is a metre tolerance on each side of the boundary.

Land registry documents only suggest the boundary, as others have said scale wise this translates to a large wide area on the ground. When did you move into the house, how old is the house, what is currently on the boundary, fence, hedge?

Tread very carefully and consider everything before you establish what you believe is the boundary. Let's just say that even if an independent assessor comes out and tells you exactly where that boundary is the neighbour might still not accept it and you have to live next door to that person.

Never assume that you are dealing with people who are as rational and level headed as you wish them to be. You might just be dealing with absolute lunatics who decide to make your life a living hell from now on.