Watercolour study of oak leaves. I'm typing this while waiting for a builder arrive.  An ominous horizontal damp patch has appeared along our dining room wall.  Judging from the ridges in the plaster beneath the new-ish wallpaper, this has been a recurring problem for some time. So next-door's builder came in to offer his opinion, and he pointed out that the damp course along that section of the house is too low to the path so it can't do it's job.  One option would be to jack-hammer out a trench "soak away" beside the wall and hope the old damp course would then work ok.  He recommended that it would be easier to simply install a new damp course.  The spoiled plaster needs to be replaced, which means the radiator has to come off first.  Also, an original Victorian downspout has rusted through quite badly and needs replacing with a new plastic one.  It's a pity to lose the historical one but carbuncles of rust are bubbling through the paint along...