Tiny insects 1-2 mm long running and jumping on plastic garden chairs. Appear to be feeding, perhaps on algae.
No interactions present.
It's a springtail, somebody may be able to give a more precise id...
I had wondered about springtails but thought that they were all longer in shape. It certainly looks like Dicyrtomina ornata from following up on the links.
Lat/Lng: 50.6385, -4.3543
OS grid ref: SX336847
garden in river valley, rural area, mostly pasture