Structural movement?

teabelly

Is it in a mining area? If so then cracks and such like are normal. The issue is whether the house is still moving or whether it has stopped. Talking to the surveyor is a good idea as they will tell you whether they were really concerned about that movement.

If the surveyor was really concerned go for another viewing and see if you can see what they are on about. Take a pair of binoculars so you can look higher up walls and at any chimneys. Also look at nearby houses and see if they are the same. Talk to neighbours and ask them if they have problems with cracking walls. Also talk to a decent local builder and ask them about what they think about the structural issues. They'll at least tell you how much it will cost to put right. If you are still worried about the issues then get a structural survey done but it will cost £700 or so and may just tell you exactly what the builder told you for nothing! I am pretty certain a full structural is also destructive and involves drilling holes in walls and doing other things which the sellers may not want so you'd have to make sure they were ok with it.