Is the first picture that box blight thing ? There was stuff growing in front of it last year so it might just be lack of light etc I suppose.
The other sides are fine - 2nd picture.
Can I trim it now or should I wait a bit? - I'm in London.
In London. Keen but lazy.
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You've answered your own question B3 light exclusion. Yes you can prune back now, light and temps are rising.
Thanks Dave. Good news on both counts
Might it green up again underneath?
Agree with Dave - that is not box blight and is likely to be light exclusion.
Good feed and mulch now and a good tidying pruning in about 4 or 5 weeks time (if it's not wet or frosty) should sort it out. Plant looks nice and healthy otherwise.