I agree with
@FWL - the searches are a trivial amount of additional money to spend for reassurance that you're not getting yourself into something that could be problematic. Perhaps more importantly - you're planning to sell the property, and the likelihood is that the buyer will be borrowing and therefore will conduct searches. Therefore you want to know in advance that there's nothing in there that will prevent them from purchasing (either lender or solicitor advice).
I just converted a small office into 5 flats. We had search info at the time of purchase (all clear). We sold 2 units, and those buyers conducted searches - again all clear. Then the environmental search company for the buyers of unit 3 had something come up that prevented them from moving forward. It was trivial, but the solicitor wasn't letting it go. However, because we had the 3 other clear searches to send them (and also the CML handbook was happy if the local search came up clear),we had enough evidence to convince the solicitor that they were being overly pedantic and got them to agree to proceed.
Bottom line, the searches turned out to be important for us from both the buyer and the seller perspective.