So the searches have come back on the bungalow. Nothing unusual to report except that the house is in an area of archaeological importance but I think I had seen that somewhere before. Also there is no planning permission (probably not needed) and build regs (needed) for the lean to that is on the back of the house - worst case scenario is I have to knock it down. I knew this was likely the case and that I would have to make some changes to it so that it got building regs. Or else I put a conservatory on instead. It is not a vital part of the property, just a useful extra area, so that is not the end of the world.