No interactions present.
Many of the leaves appear to lack a bend where the petiole joins the leaf blade, which would indicate Bog Pondweed Potamogeton polygonifolius.
It is not particularly unusual to find both species together.
I was assuming that by broad-leaved pondweed you meant Potamogeton natans, hence my comment about finding both species together.
Lat/Lng: 54.88516, -2.0795
OS grid ref: NY949544