I came across this mite by accident crawling up a wall in my rear garden. I am unable to determine the species, but this tiny spider relative is so small (up to 0.6mm long) it is barely visible with the naked eye. Plus I was straining my lens, it was so tiny.
They feed on at least 200 different species of plants, including fruit and vegetables. They can be quite a serious pest of garden plants, house plants, greenhouse plants and various crops. They suck the sap from the plants with specialised piercing mouthparts, and this causes the leaves to become brown and mottled, and in severe cases leaf loss occurs. Adult mites spin a fine silk webbing over leaf surfaces.
They are common and widespread throughout Great Britain.
Photograph taken February 2014, rear garden, Staffordshire.