Hi, I'm in the process of doing up our first home and have found gaps and loose bricks/slate under one of the interior block walls. The house is a bungalow and the wall is not load baring. My thoughts are that the foundations have settled at some point and somebody has tried to shim the gaps with slate. I'm no builder though so i could be totally wrong. I also know that two other walls in the house have had some movement at some point because the door frames are way out and there is a gap between wall and ceiling. I really want to know what i should do before i get the walls skimmed and skirting fitted.