I have no idea what this is..please help!

I have no idea what this is..please help!

Observation - I have no idea what this is..please help! - UK and Ireland. Description: Please can you help me identify this creature? I have look at many options on this site (and others), but non that seem to match. Many thanks in advance. It was small - 5mm and continually running around the circumference of the mushroom.

Please can you help me identify this creature? I have look at many options on this site (and others), but non that seem to match. Many thanks in advance.

It was small - 5mm and continually running around the circumference of the mushroom.