Tiny red spiders?

Tiny red spiders?

Observation - Tiny red spiders? - UK and Ireland. Description: Does anyone know what these tiny, fast invertebrates are... spiders or mites maybe? Many of them running around on a concrete drinking trough in a heathland nature reserve.

Does anyone know what these tiny, fast invertebrates are... spiders or mites maybe? Many of them running around on a concrete drinking trough in a heathland nature reserve.