1930s house

Hi everyone, I have stripped the plaster from the external wall of my bathroom, and I am preparing it for tiling (using multiboard). This is on a 1930s standard brick wall with crumbly lime mortar in some spots. There is a 42cm wide x 32cm high gap at the bottom of the brick wall. I believe...

I own a 1930s semi which i moved in to last year. I noticed damp on the rear external walls in the upstairs and down stairs rooms last winter. Brick work/ mortar wasnt great so I had the rear elevation pointed with lime mortar and still damp. I am yet to remove the plaster could this be the...