Your surveyor should be able to give you an indication of this.
Worth considering though is that if it is only 5 years ago that money was spent on damp proofing and it has come back already, and badly, do you really want to buy into such a potentially costly and long-running problem?
Ary.
-------------------------------------- ***Do not, I repeat Do NOT feed the Trolls! *** *** All Hail the mighty hamsters! ***