Confidence: It's likely to be this, but I can't be certain.
Notes: The nice rounded labellum with rather shallow lobes says southern marsh orchid to me. Also it appears to have a wide-ish spur and no trace of spots on what foliage is visible. Lateral petals aren't particularly erect, agreed, but enough and on balance I'd say its D.praetermissa. (if it does have a bit of a spotted orchid in it i'd go for the cross with D.maculata = D. x hallii on the basis that it retains the rounded labellum well and has more subtle markings)