I found this curious, tiny critter under a stone I lifted in my back garden. This springtail has a uniform purplish iridescence. Length up to 4.5mm.
They feed on plant detritus.
They are seen all year round, and are found in damp and shady places like under logs and stones, and amongst leaf litter. Very common and widespread throughout Britain.
Photographs taken June 2015, Staffordshire.