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Red Spots on Leaves - What's at work?

Can anyone shed some light on what might be going on here? Red spots on the leaves of my Pieris and Persicaria. Spots on my Hydrangea too although brown rather than red. The Pieris and Persicaria are sited in the same section of the border with the Hydrangea a few metres further down.
Thanks in advance.
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I think the OP's would have had some rain by now - the query's four years old
Rain doesn't affect them in any way.
I live in west central Scotland - not where that photo is...