Hello Jo, in answer to your questions:
No dangerous structure notice has been served, although there is an old lady living there and it potentially could be dangerous to her. as it is about 7 feet tall.
No it did not crop us as a structural survey we had done - the wall was noted on the buyers survey but it was deemed as repairable and not something that had to be instantly seen to. Basically it was seen as " not going anywhere but has a large crack in it that needs some attention at some point in the future). It was obvious that it was a very old crack that we were told had been there for 20 odd years.
The tennant at the property is in her 90's and she complained as soon as the old owner left and we moved in. (May 2013).
The co-owner is the council.
As yet, we have not been consulted on any of the prep cost. The wall has been strapped with scaffolding and boards, nor were we consulted on the two/ three surveys that took place prior to this strapping.
I spoke to one work man who said that the council had commissioned him without even asking how much his services would cost?
He spoke to me privately saying that the surveyor who made the drawings was saying that it was an expensive job.
I have no idea of the costs so far (say £1500-£3000) and as the surveyors are saying that the wall needs to be rebuilt from scratch that it will be £10-12K and I presume pre VAT. Of which through party wall we are deemed to pay 50%.