Hollow stem, reflexed calyx teeth.
No interactions present.
...from the photos. It would help if you could give the diagnostic features that led you to the ID.
There was also no redness at all to the flowers and the foliage was luxurient and about 12 inches tall growing in damp grassland.
Then checked to find reflexed calyx teeth and also it had a hollow stem which were the two main diagnostics I went with in the field.
Hope this helps.
OK, my books say reflexed sepal teeth in bud, this is in fruit, right? Not sure about that, but agree the hollow stem is a good diagnostic. Useful, cheers for that.
Lat/Lng: 51.7165, -3.4842
OS grid ref: SN975030