The cache is not at the posted coordinates.
There are around 52 species of wild orchid in Britain, though many are very rare and/or localised. Some can be difficult to distinguish - I believe the orchid pictured below is the common spotted orchid (Dactylorhiza fushcii) (but am happy to be corrected), but there are some with more bizzare flower shapes, including bee and spider mimics. Identification is complicated by the ability of some species to hybridise with each other. Most flower between April and September, and chalk grasslands are usually preferred, though some species are found in a variety of habitats.
Puzzle