Already since 1992 an autogamous Epipactis population, the 'Whiteleaf' population at Princes Risborough in Buckinghamshire (England), has been identified as similar but anyway different from Epipactis leptochila and Epipactis neglecta, with similarity to Epipactis helleborine. Jürgen REINHARDT informed me years ago, that the images could probably show a clan relatively different from E. neglecta sensu KÜMPEL, which also occurs in his region in Eastern Germany, and which in the article 'Bemerkungen zur Variabilität der Übersehenen Stendelwurz - Epipactis neglecta (KÜMPEL) KÜMPEL - in Nordwest- und Nordthüringen', which he published together with Rolf RICHTER in Ber.Arbeitskrs.Heim.Orchid. 20 (2): 97-113 (2003, publ. 2004), is mentioned under the provisional name 'Epipactis spec. 2'.
Only in 2020 in Ber.Arbeitskrs.Heim.Orchid. 37 (2): 109-121 Karel KREUTZ, Leslie LEWIS und Graham GILES described this clan as Epipactis neglecta var. collina.
In Ber.Arbeitskrs.Heim.Orchid. 38 (1): 100-110, R.M.BATEMAN wrote in an article in 2021 that the clan would stand between Epipactis leptochila and Epipactis helleborine, and would have nothing to do with the continental Epipactis neglecta which he reckons to be nonsense anyway. He re-combined the clan to Epipactis leptochila var. collina, and also took into consideration its assignment to Epipactis x stephensonii, which is the hybrid between Epipactis helleborine and Epipactis leptochila.