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Sounds like it's probably the box moth, not a blight as such. The caterpillars can munch through a garden in a matter of days. The leaves brown off and the plant dies. Have a look for some green hairless caterpillars. We've saved our box plants from several attacks by using a product called Xen Tari or something similar that infects them with nematodes that eat them from within. It's a horrible way for them to die but I do like my box bushes to be green and alive.