Small pea like flowers 2mm in spikes. 3 leaflets.
No interactions present.
There are 5 Melilots in Stace but telling them apart is not easy! M. indicus is not common but possible.
It doesn't help that I don't know where the soil has been brought from. I will take some measurements to see if I can get a better idea.
but M. indicus looks a good suggestion.
It is getting more common I think, especially on dumped soil.
Took measurements of flowers (2mm) and leaves (up to 20mm)
Good, confirms the impression from the photograph.
Lat/Lng: 53.7076, -1.8886
OS grid ref: SE074234