Is my box blighted and if so what's to be done?

[Flipity]

Advice needed by notive gardener

It looks like you have a box moth caterpillar infestation. Buy Xentari asap. Spray it once now and once in a fortnight. The box plant will probably look shit for the rest of the year, but it should revive by next year

Agreed that's box moth caterpillar damage

Jetwash it (several times) and hope. I’ve known them survive. But you don’t have much left.

Rip it out, replace with yew. Actually wait to plant yew till the winter and get bare root plants, miles cheaper.

Yes. It will keep happening. I'd get rid and replace with lonicera nitidia (if you want the same look).

Yes, either yew, lonicera nitida or ilex crenata. Lonicera is well cheap and strikes from cuttings really easily.

This.👍

Nothing will make it come back and look good this year but next year you will see lots of new growth and later on you will forget it ever happened (until the next time).
We have some box which is over 20yrs old and have seen it attacked twice but with patience, it has recovered perfectly.

We’re removing ours including a large and old box hedge. It’s sad but I agree with suggestions to replace with yew or ilex cremate.

Yes to xentari. Used to be able to buy on Amazon but I think they now have their own site. It will recover over the course of the year and next. You spray between March and October as this is when the cycle is. The instructions are easy to follow. I just use half a sachet per spray and it does the job, depends how much box you have. Your other option is to dig it up and replace with something else.

As above, our was destroyed, we have just removed it, it seems rife this year, gutted

Even if you get it back on track the infestation will keep happening - those moths know where your box hedge is now.

I would take it all out and replace it with Ilex crenata which looks very similar.