69M Uninformed Horrible People....and...
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No best answer has yet been selected by Jo2005. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Then I'd suggest you've little comeback on it being missed the first time around. It may be that the first survey didn't even cover the roof space - some of the so called "valuation" surveys are only designed to reassure the bank that the property is worth at least what they are lending. They are the surveyors customer not you (even though you're paying!)
Anyway you don't say what the detail is. It sounds as if the chimney breast has been removed and the surveyor cannot tell if a lintel or RSJ has been put in place to support the chimey stack above it?
If that's the case it may well be that it's there and the surveyor just couldn't tell you may need a structural engineer to investigate.
I know it's a bit late now but for future when you're spending hundreds of thousands of pounds on a house or flat it's a false economy not to spend a thousand pounds or so on a full structural survey.