I should say it is a cavity wall.
After some clearing out today I think I've found the top of the foundations i.e. a solid level starting point.
The fact there is a joint where the outer leaf should be seems unhelpful.
Hi all,
After a leak from my internal plastic SVP to clay joint was repaired by a drainage company (replaced with plastic and joined by a flexible coupling to the clay pipe outside the property instead) I am left with the following to reinstate:
The width of the opening is about 25 cm and...