Hi, thanks for replying.
I'll try to describe this as best as I can, There is a central passageway beyond the front door. to the left is a dining room and kitchen, these appear unaffected. to the right is a lounge which runs the full length of the house, this slopes noticeably towards the back right of the house. The stairs going up seem to slope slightly and the landing slopes a little bit more, again to the right. This floor has three bedrooms and a bathroom, the bathroom seems fine, the bedroom facing the stairs has the most pronounced slope of all, falling towards the landing/rear of the house, the other two bedrooms have slight slopes again towards the rear of the house. The next flight of stairs seem to be reasonable unaffected but the two attic bedrroms have slopes to the rear also, particularly the right hand one. Its difficult to quantify the amount of slope, i.e. so many inches across the width of a room, as I didn't have a spirit level and tape with me, but I should think that the worst room has a four inch difference between front and back. I won't be able to get decent measurements of the degree of slopeage (is that even a word!) until next weekend but I hope there is enough information there to allow you to give some help.