Doesn't look like Broad-leaved or Wood Dock. So which species?
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So branches being less than 30 degrees to stem is obviously not as diagnostic as Rose suggests?
its still a bit young though for that (and that is mainly to tell it from conglomeratus). If you can take a picture of the flowers/fruits we should be able to confirm it
Lat/Lng: 51.4739, -2.5857
OS grid ref: ST594751