I have used resources in this thread to investigate cracks, and have another recommendation to add. Robert Walton-Sharp visited the property, carried out a full survey, made recommendations. It was extremely helpful. He is a structural engineer, so better versed in the specifics of this than a building surveyor, and his prices were reasonable - the lower end of the quotes I got from structural engineers (and the same as some building surveyors). Worth mentioning that some of the building surveyors I spoke to referred me on to structural engineers. Robert Walton-Sharp BSc(Hons) CEng MIStructE SHARP Structural Design Ltd ? Chartered Structural Engineers 07973 253 164 020 8764 2602 I also had a bad experience with one of the contractors mentioned in this thread, and would be happy to provide info over DM.