Hi , i have looked at the back of my house and noticed that the chimney brickwork on the roof is leaning by approx 6 inches to one side over the entire length of the chimney (about 3 foot), also the wall from gable to about 6 feet under looks slightly bowed out , it is a terrace house and the next door neighbour has the same problem , but he has his rendered ( good idea)?, does anyone have an idea what has happened and what needs to be done if anything?? the house is 2 world wars old,