Possible Wooly Bear?
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Great picture of this little millipede!
Superficially similar to the larvae of Anthrenus (and some other dermestid beetles). As well as the characters given by Andy, the millipede has distinct antennae just visible at the front on this specimen, under the anterior setae. The legs are not visible, but there are many more than the 3 pairs of an Anthrenus larva. Polyxenus is often found under bark but sometimes comes into houses.
My find of this tiny millipede was under the flaky bark of a mature Sycamore on a council estate. The tree is a very large/old specimen and as the site is virtually roadside I fear for its continued existence. Not so much for the tree but the millipede. For in all the years (many) I have been seeking out inverts this tree is the one I have encountered Polyxenus lagurus.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
Lat/Lng: 50.9001, -3.4905
OS grid ref: SS952122
In House, damp(ish) wall.