The floor is concrete - no signs of damp at floor level at all.
The render looks in good nick - when it rained last there was no sign of any lasting damp on the outside around the render.
I’m hesitant to start digging up on the neighbours land, their building is within a meter...
The thing is that next door have built right up to the house - so that the bottom few feet of that wall is essentially now underground.
I can’t change that, so do you have any thoughts on what I could do?
So. 6 years ago they built a house next door to my mates granddad. He is end of terrace and the new house foundations lifted the ground level on that side of the house so the internal floor is now about 40cm below the outside ground level.
The picture below shows the outside. Inside the house...