I'm afraid that definitely looks like box blight - it's affected my plants again. Unfortunately we've had some perfect conditions for fungal diseases this year (lots of rain and now warm temps).
If you don't mind using fungicide I'd spray now (one of them is effective at controlling box blight) and again in 2 or 3 weeks. After that - regular liquid seaweed or Top Buxus feeds.
Heaven is ... sitting in the garden with a G&T and a cat while watching the sun go down
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If you don't mind using fungicide I'd spray now (one of them is effective at controlling box blight) and again in 2 or 3 weeks. After that - regular liquid seaweed or Top Buxus feeds.