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I'm surprised an engineer would say that.. Sure if it was 20-30mm nominal movement in the path slab and no structural damage has occurred in the house. But 70mm is worth getting an engineers report imo. If cutting up the slab you have to factor in cost to remove it, cost to reinstate it, and...

I don't think cutting up the pathway slab will reveal anything other than a nice view of dirt. There are a number of factors which cause subsidence and would be easily identified by a qualified structural engineer (no slab cutting required). How serious are you about sorting out the problem...