Thank you for the above. according to your title deeds, your property is freehold property and therefore you own all of the property including the loft space within the red edging on the plan. Accordingly, there is no provision for your neighbour to seek to claim any part of your loft within the red edging.
There is a very small part of your property number one and two On the file plan which overhangs the black line denoting the physical boundaries of your and your neighbours properties. To that extent, the part numbered 1 excludes the 1st floor of that part of the property from your title but you will own anything above and below the first floor.
Conversely as regards ***** ***** number 2, you only own the first floor of that part of the property and anything above or below it will be owned by your neighbour.
Accordingly, if any part of your loft is over the part numbered 2, or any part of your property otherwise is over the extent of the red edging on the plan, it may be that that part of your property is a technical trespass on your neighbours property. notwithstanding this, and in particular any part of the loft space over the part numbered 2, the loft space above your property belongs to you.
in the event any part of your property does extend the on the red edging or any part of your loft is over the part numbered 2 on the plan, it is very unlikely at this stage that your neighbour would be able to seek to recover any part of that property in practice as you would likely have a claim either for adverse possession of the same or would be able to defend any such application by your neighbour to claim such part of your property on the grounds of something known as estoppel.
Is there anything above I can help you with any further or clarify for you?