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in Problem solving
It doesn't look like box blight, so it's more of a case of neglect me thinks. I think it needs a feed and some minor pruning of the dried out bits. I'd leave it grow and put on some new growth before reshaping. A good drench once a week for a few weeks and feed should see a different plant in a few weeks.
I agree with Dave it doesn't look like blight it seems to be the whole leaf turning brown whereas blight would make brown blotches on the leaves. Give it a bit of an everyday fertiliser (Growmore perhaps) and a good soak and it should be back to normal in no time.
One of mine has done the same. I upped the water and feed...but it did not work. I took it out the pot and a lot of root has rotted. Instead of being dry the water was not draining as the crock covering the pot had acted like a plug.
So it is worth taking it out the pot and checking the roots.
If the water is seeping out almost straight away I'd plunge the plant into a bucket of water first and leave till bubbles stop rising. having looked at your picture again, I think I'd leave removing anything till the new growth appears, the dead leaves will fall naturally anyway.
If it is under watering, which relooking at the pic is likely, then the leaves will regreen over time, so do not cut off.