I know I'm on my own here, but I think that all house surveys are a complete waste of time. Anything they tell you is usually based solely on a 'visual inspection' - which basically means that unless there is something obvious (which you would normally pick up on your own anyway), they add nothing. They'll say things like "there should be a steel here, it's not possible to say if there is or not without disturbing the fabric, but we suggest you get it checked". Yeah, thanks.