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From the fantastic looking picture i would say that it is Matteuccia struthiopteris or the Shutle cock fern also known as the ostrege feather fern.
Im not 100 percent sure but from the picture that is what i would say it is.
A marginal plant has a growth that reaches upto 1.2metres high with a spread metre it spreads by ryzomes which are under ground creeping stems. It is native to america and east asia and europe.
It reminds me of preastoric times and if a dinosaur poped up around them it would not look out of place. An all round beautiful plant.
I believe ferns like shady spots under tall tree's, especially woody area's.
Lat/Lng: 51.415238660055, 0.017242580652237
OS grid ref: TQ403703
Likely to be on my backyard