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There are three subsp. of this. Subsp. argentatum has large and very obvious silver blotching on the leaves - as shown in the photograph. Subsp montanum and subsp. galeobdolon usually have some much less conspicuous blotches early in the year (subsp. montanum is often seen on large estates where it was probably introduced by Victorian gardeners). They differ in the hairiness of the stem (hairs only on stem angles in subsp. galeobdolon and hairs on faces of stems as well in subsp. montanum. Worth watching out for the last the subsp. as they're much less common.
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Thanks for the additional info.
Lat/Lng: 52.7, 0.3
OS grid ref: TF5820