Kevin wrote:
There is a bit that is breaking up next to the existing wooden floor,
in line with the original window opening so I could excavate here as
whatever I do this bit needs repairing but I will need to ensure that I
excavate above the slab and not the original wall.

Drilling just a small hole will tell you almost everything, from the
feel of it and from the look of the powder on the bit.


--
Ian White