I'm in a chain of four, potentially more. My buyers are buying with proceeds of their sale (no mortgage) as am I, I'm not sure about my seller but believe she may be without a mortgage too. As valuations seems to be one major factor in delays how long did the mortgage add to your timescale (or if no mortgage how much time did it take) to complete your purchase?
Also, which of the searches would you say are a complete and utter waste of time (pretty darn sure the flood levels haven't changed nor have the drains or possibility of being built on contaminated land since the last few times any of these terraced properties have sold ad they are over 100 years old).