Oh, I love going on about my house!
So, on the survey was the apparently major problem, which was damp. This was what had stopped anyone else buying the house. (One sale had falled through after the survey, and as a result of that, the owner gave anyone who requested a second view a copy of not one but two surveys, as she'd had a second survey done...) Ironically, I have appear to have fixed quite a lot of the damp problem myself, with the aid of my lovely builder, the SPAB, and their two day homeowners course (which I keep banging on about on here, but it must be the best 100 quid I've ever spent).
Problems that weren't mentioned included the poor state of a lot of the windows (which need to be repaired by a specialist joiner costing many many pounds), the amusing places where missing plaster had been replaced with plaster board (sounds minor but looks dreadful), the lack of insulation in one room, the incredible lack of soundproofing / insulation in the ceilings / floors of a couple of rooms, the irritating electrics (we had them checked out for safety, but not for practicality, iyswim), etc etc. Also not mentioned are the cellars that the builders have just found
We're currently doing our dining room, which has involved the joiner, the plumber, the electrician, and the lime plasterers. All of whom I co-ordinate, and have to be around to meet with. And technically this is just a "repair". God knows what will happen when we actually start making changes.
One issue is that you can't buy much off the shelf - e.g. we needed a new door, but we can't buy a door to fit the space, so we have to have a door made. We removed some cupboards from the kitchen, which meant we needed some new architraving and skirting, but it had to match the existing architraving and skirting, so we had to have architraving and skirting made to match. (having taken bits of architraving and skirting into Travis Perkins and B&Q and held them up against everything in stock).
But having said all this, we did knowingly buy a house which needed work doing and paid less money because of that - it's just that the work that needed doing isn't the work that we expected!