Quite a few of these on Horse-chestnut. Perhaps 3-5mm long
No interactions present.
What features allow you to ID it as that species?
Have you not had a look here..? You will see you are looking at the same species you show in your observation image. The colour, venation, being the obvious keys. The fact that you found yours on Horse Chestnut is not relevant as this species is some what ubiquitous, and very common. I find it on a daily bases...I very really snap it now, however I do record it.
PS You might find my Psocoptera set interesting.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
Certainly looks like it and none of the others in that genus look very close. Although there is one (rare) one for which no photo is provided.
Lat/Lng: 54.959285540279, -1.697301864624
OS grid ref: NZ194627