DIPLOPODA (millipedes) > JULIDA (cylindrical or snake millipedes) > Julidae

This eyed, relatively small, 10-16mm long millipede lacks a projecting telson and is one of four species known as the Cylindroiulus 'luscus' group, because they cannot be reliably separated or identified for recording purposes without close examination of the genitalia. That said, Cylindroiulus britannicus does have characteristic hairs on its rear end around the anal valves that may be visible on good photos.

The individual species also have different habitat preferences with Cylindroiulus britannicus having strong associations with deadwood that the other three do not share, so if an individual is found in such an environment, like under a log as this one was, then it's a pretty safe bet.

The other three in the 'luscus' group are Cylindroiulus latestriatus, which is primarily a coastal species favouring dunes and sandy soils; Cylindroiulus parisiorum, a nationally scarce species most associated with synanthropic habitats and semi-natural grasslands, with most records coming from either East Anglia or central southern counties, mainly Oxfordshire, Berkshire and Bedfordshire; and Cylindroiulus truncorum, a non-native, but now naturalised, species with very few records outside hothouses. Consequently, it seems to me that locally I'm only likely to encounter Cylindroiulus britannicus or, if I'm down at the coast, there may be areas where Cylindroiulus latestriatus could be found.