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Certainly a spurge, but difficult to get a sense of scale. If the leaves are untoothed, and narrow, then it is wood spurge.
...if you look at the way the flowers/bracts are held in an umbel-like spray. As Roger says, hard to get a sense of scale from the image. I'd go for either E.helioscopia which is native:
or it may be a garden escape of E.polychroma.
Lat/Lng: 51.0, -1.4
OS grid ref: SU4827