It's definitely a Marsh orchid but the species - I'm unsure of, darkest Orchid I've ever seen, wondering if it is perhaps a Northern Marsh Orchid?
Growing with it's base submerged in about 5cm of water.
This flower is very interesting looking because it slightly resembles a heart shape. The plant itself has leaves with alternating placement and is grassy at the base. There are white petals hanging vertically off of the pink part of the flower with some yellow coloring
Seen on walk from Ormskirk to Maghull (UK), chocolate-brown head, pale grey body, black tips to the primary wing feathers, and red bill and legs.