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If it wasn't for the creamy/white anthers I would have said this was H.x massartiana (broadish leaves, florets spiralling round stem).
I do not think is a 'pure' H.non-scripta.
It is in a nature reserve about 1km from the nearest gardens and seems like semi-natural woodland. Leaves are only 20mm wide. The leaves have been extensively eaten and I saw a Roe Deer which may be responsible.
Lat/Lng: 52.24987, -0.04193
OS grid ref: TL337631