I was thinking move of helical bars and resin to just reinforce! I just can fit my house key in a couple of places! Also this is the other side of the rsj and the crack pretty much goes straight down, the old bricks are made of the old coal deposits, which are not very strong! Its a cavity wall im assuming by i would have thought there would be movement boths sides, the other side is the old woodchip wall paper. Theres no creasing or anything. Also on the external wall with the straight crack theres nothing in the render. Thats why I thinking its more to do with the load above causing the cracks