The stem is that of a Red Campion
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Thanks for the id and the info....
They do definitely have that aphid-type appearance, if that makes sense, all gathered together on the stem, though rather more 'beetle-like' than I'm used to seeing.
Apart from anything else, the clarity of the picture isn't great as there wasn't enough light and it was so breezy the plant wouldn't stay still! Thanks again, Poppy
Lat/Lng: 52.6, 1.2
OS grid ref: TG1713