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Clematis is the Latin or as they say now scientific name.
This is correct name, described as mid blue with darker veining and greeny beige anthers. This variety flowers July onwards and is a hard prune plant, i.e. flowering on the new growth.
I suspect the photo brings the image up slightly too purple.
A good link for checking Clematis is
Lat/Lng: 52.4, -2.5
OS grid ref: SO6782