No interactions present.
The larvae are presumably the same species.
University of Edinburgh and Biodiversity Observatory (OU)
I am told (by Martin Harvey) that the larvae probably belong to a different beetle as those of C. oricalcia are lighter in colour.
PS. Looking at some recent observations, maybe the larvae belong to the Celery Leaf Beetle (Phaedon tumidulus)
Lat/Lng: 52.025666666667, -0.71016666666667
OS grid ref: SP885371