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Is this a pest?

What is this? And is it damaging? They are swarming around my apricot after it was infested with a small black beetle (being dealt with organically with a lime wash), around my almond tree and my roses. I can’t see any damage, nor does there seem to be any sticky residue that may have attracted it in the first place, but I may be wrong about that; it just seems to swarm and crawl around the leaves and trunk frenetically before swarming again. Would appreciate any suggestions.

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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.