these can be seen on the Ivy on sunny days
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Andrzej Woznica is an expert on European Suillidae, so if he says that is what it is, it is safe to assume that is what it is.
I meant Heleomyzidae. I thought Suillidae didn't look right when I typed it.
Lat/Lng: 51.5901, -0.0882
OS grid ref: TQ325896