Small Adder's-tongue - a big thank you to Kev for pointing this out.
I had brief views of the singing Lesser Whitethroat, along the back path, and a couple Swifts flew over Greenland Lake, but I never made it to the hide.
Subterranean Clover - the species I was hoping to see. It took some searching but this beautiful species was eventually discovered in the Crocus Compound.
Very much a record shot of a brief and distant Spotted Flycatcher. It soon flew off inland.