That is a bit different from being in the offer period of buying a house. Having the wall ties, damp and timberwork checked by companies who will quote for remedial works is a good supplement to a full survey (certainly not a substitute for it). The quotes can then be a handy negotiating tool as...
Your detailed survey is undoubtedly a valuable tool in identifying what might need to be done, or what could happen so that you can make an informed offer accordingly, and plan any expenditure that might be required on the property.
I agree you might have recourse in tort to claim damages...
The survey makes you aware of any (not all) potential problems further down the line, not sure what you mean by protects you other than giving you a heads up?