Growing under a road bridge that crosses Caldecotte lake
No interactions present.
The branch with flowers does indeed look very much like the figwort from the desert here in Egypt. Interestingly, some of the tips of the buds also seem slightly munched off.
Have you agreed whether this is S. aquatica or S. auriculata?
Lat/Lng: 52.0, -0.8
OS grid ref: SP8835