I found this little chap on a slide that I had left under a piece of bracket fungus for a day or two. The fungus had been collected from the nearby park.
No interactions present.
This page seemed relevant: http://coo.fieldofscience.com/2012/07/pygmephoroidea-lives-of-phoresy-an...
This looks a bit like a springtail to me rather than a mite
Lat/Lng: 52.061168, 1.159024
OS grid ref: TM166450