Habitat = pond edge
No interactions present.
... as the leaves are not "round" enough for Lysimachia nummularia.
Incidentally, V. beccabunga is one of the few plants - in my opinion - where Rose lets itself down, as the illustration is nothing like the actual plant.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
The leaves of Veronica beccabunga would be shortly toothed.
...for your definitive ruling!
Not V.beccabunga then, the leaves of which are, as you pointed out, toothed.
Lat/Lng: 51.6405, -0.0041
OS grid ref: TQ382954