It’s vine weevil! You can search this forum under that and there are a lot of threads about it and also google. Lots of advice on the tinterweb. The weevils are generally nocturnal which is why you won’t see anything. They are a pain in the proverbial!!
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'orrible blighters either way!
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thanks Dove, made me smile !