Comfrey in gravel by the roadside, in front of houses. Probably planted, though a good number of wildflowers grow in the same environment.
No interactions present.
The stem of this plant has small but definite wings, and Rose says S. orientale is unwinged. I have added a photo showing irregular calyx teeth, clear on the second flower from the left where the gap is deeper on the right - though they are shorter than Rose's illustration. So I am still dubious!
An interesting point about the wings, though Rose does give the length of the calyx teeth as the key difference for orientale. Maybe there's a mix in there somewhere and it isn't a 'pure' orientale?
Lat/Lng: 51.376723333333, 0.0073016666666667
OS grid ref: TQ398660