This is very small juvenile millipede Cylindroiulus sp. which I discovered under a plant pot in the backyard.
They can grow up to 25mm long, but this one is barely visible to the naked eye. It has a fairly distinctive dark mask across its eyes and a pale tail end.
Common throughout Britain, it feeds on dead leaves and other plant detritus. A woodland species, but also found in gardens.
Click and click again on the image to get that little bit closer …
Of note, I have been experimenting with a homemade flash difffuser which fits on the end of my lens with a ring adapter, rather than fitted over the diffuser itself. I have been fairly pleased with the results, and in this series of images the highlights would normally have been blown to a pure harsh white, but they are a soft glow with the diffuser, which, believe it or not, is made out of an A4 plastic zip folder with a piece of thin card placed inside, cut and fixed around the lens.
June 2019, rear garden, Staffordshire, England. © Pete Hillman.