I think this is a straight forward Cirrostratus arrangement. They are high level clouds and the wispiness is clearly seen against a clear blue sky.
We're looking at ice crystals forming, often ahead of an incoming depression with its lower air pressure - a sure sign of this happening is seeing these clouds grow and thicken - a sure sign of poor weather approaching. There are variations of these clouds including Cirrocumulus which is a sure sign of approaching wet weather.
The added bonus with this photograph are the vapour condensation trails from aircraft which have passed overhead, also known as "contrails".
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