aphid on oak
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Thanks does indeed look like this species, will keep an eye out for them later in the year and try to get a better photo as they are rather spectacular (for an aphid).
From what I've read the winged adults are fairly impressive (well, yes, for an aphid) and that would help to confirm the ID.
Lat/Lng: 52.026041388889, -0.70684888888889
OS grid ref: SP888371