This is marsh cinqfoil, Potentilla palustris, a plant found in boggy, peaty land, which it brightens with its lovely magenta colours. It can grow quite big, up to 18".
When the insect is digested, only the hard chitinous exoskeleton remains. Although the plant obtains some nitrogen from this process, it also has roots: the insect meal is a 'dietary supplement'!
This first is an early marsh orchid, Dactylorhiza incarnata, which prefers damp grassland and, locally, the lime-rich, sandy soil of the machair.
Many thanks indeed to Martin for the pictures.