22yrs ago when I bought my last house, my solicitor advised me to have a structural survey as the house was 100+ yrs old, and I declined. He asked me to sign an indemnity as he would be deemed negligent if it came back on him, which I was happy to do. When we had finished the business, he asked why I was sure I didn't need one. I replied that half my working time was spent doing maintenance on a building older than that, and I intended to take my friends, a builder and an electrician around with me to look at it and put £100 on the bar of the nearest pub afterwards so we could have a good chat. He said not to quote him, but I would find out far more doing it that way.