Flowerhead about 1 cm diameter. White petals with a yellow centre.
No interactions present.
But I may well have passed it over, thinking at a quick glance it was Bittersweet. And there it was in Stourport-on-Severn, where I worked for nearly a decade!
It has an interesting history, if you read the Wikipedia entry at
In my experience the two principal habits that Solanum nigrum turns up in are
1) maize fields (and to a lesser extent other arable crops) - it will grow on wheat and barley fields after the crop has been harvested.
2) urban roadsides, perhaps more often in the gutters than on the pavements.
The photo shows all the plant, so no wonder you missed seeing it.
I've got a patch in my garden where it grows and spreads. It's difficult to pull out if you let it get too big - one plant can cover a square metre, and it produces hundreds of berries. Not my favourite weed!
Lat/Lng: 52.3445, -2.2856
OS grid ref: SO806718