New purchaser has just now found out he has a problem. When I asked whether they got pre purchase inspection the answer was yes, by a franchised inspector who did not pick up on severely dished slab.
This is the second time I came across franchised inspectors missing an elephant in the room. On a pre purchase inspection in Eltham they missed 50mm floor subsidence at rear of the house.
If the seller was aware of that serious defect and sold the property without disclosing it they can be in a lot of legal hot water.