We've been both ends of this. In one case we withdrew after the survey and the seller made a huge price reduction thinking we were after a discount but we didn't go ahead as we didn't want to deal with the issues the surveyor raised regardless as we had small children. Usually doing a survey means the buyer has committed cash so it's more likely to proceed and they are not dithering having put no money in. However, way back in the late 70s I had a seller let me do a survey AFTER they had already exchanged contracts with another buyer! All my savings gone 😕 Never understood that. It's not easy these days as sellers appear to put offers on several properties to secure them and then see how things go trying to get the prices lowered on the one they really want while keeping a backup just in case. The last flat I sold the buyers had lost a purchase and were just desperate to move before the arrival of a baby, we accepted their offer, which didn't involve a mortgage, even though it was not the highest as we thought they would go through with the purchase, which they did. They invited me back for coffee a couple of years later and clearly loved the place. We were lucky as many struggle and we've learned to get things moving asap, all our paperwork such as building certificates, guarantees etc, the name of the buyers solicitor, evidence of their funds, survey dates, progress of the buyers own sale if it's a chain and so on before we believe it's going through. So many reasons things can go wrong and while some are buyers bad behaviour, some is down to luck and things out of their control. I hope the sale goes through ok now 😊