Igrow, Your pics do look more like spider mite, but difficult to be sure without a magifying glass. There will be fine cobwebbing on the underside and you can see the little mites moving about. (Called two spot mite in USA, a better name, as they are not red.)
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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It's most common in the south of England, but it may well be spreading further. Never seen it here, but we're a long way from the south of England.
I live in west central Scotland - not where that photo is...
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."