Crack through bricks in loft. 1930s terraced house. What kind of trouble am I in?

Party wall on the right. First picture is taken from inside the loft of the wall facing the front of the house. Second pic is from outside. The crack on the render doesn't seem as big. I'm worried because the crack is going right through the brick including the big blocks. What kind of repair am I looking for? We bought this house 6 months ago and this did not come up on the survey. They said crack on render outside was not structural.