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Thanks for info. Mind, it's not possible to get much further from the coast in England than where this was found! If I go back soon, would any further photos help?
A side view of the calyx would help and info on hairs on the stems (probably few). There is a pink form of sepium (forma colorata) to consider also! It would have glabrous stems.
Lat/Lng: 52.374730555556, -1.4350638888889
OS grid ref: SP385753