Walk away unless you plan on doing a large, time consuming, and expensive renovation. Don’t fall in love with the idea of what the property could be. Make sure it suits your needs now and the seller is much more transparent.
In the US there are some things covered in the survey and some not. We paid for an independent home inspector to go top to bottom of ours before purchase. I tested the water, had the most recent electrician go over our system, and talked to the neighbors about the history of the property. It was very good to have all that information and worth the money to pay for. It greatly reduced the worry and I got to know the property before buying it.