Large distinctive gall on Elm leaf
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A 'gang' of aphids. Good one! I always wondered what the collective noun for aphids was. Now I know!
University of Edinburgh and Biodiversity Observatory (OU)
It seemed to fit somehow, especially when I read there could be up to 50 of them holed up inside, waiting to make a breakout...
Lat/Lng: 51.46972, -2.61915
OS grid ref: ST570747