Thanks for all your replies.

I cut the Viburnum right back hard and destroyed all the eaten leaves.
I've given it a few feeds of seaweed fertiliser. They are young leaves
sprouting already.

I check it each day and pick off any aphids. There are some mealy bugs
on the branches so I'm squashing them, well the ones I can reach.

I hope to catch the beetle in it's tracks if it comes back later in the
year.

I must say that it smells a lot sweeter out there now.:-)
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I'm a sew and sow!