Would also like to get an ID for the mites, please.
No interactions present.
Can't help with the mites, sorry!
What is the substrate that they seem to be feeding on?
Entomologist and biological recorder
I can not be precise, but it is on kitchen waste in a covered compost bin.
I have looked at what are commonly refereed to as the Picnic Beetles, the "s" having me thinking that there might be more than just Glischrochilus quadrisignatus, not so, as far as I can make out. The latter I have recorded from the same bin, but have it down as one of the other four orange/reddish spotted types.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
There is a key to the three species of Glischrochilus in Beetle News, Issue 4, available to download from the AES:
Lat/Lng: 53.2062, -0.5644
OS grid ref: SK959686