This grower is sure of this plant identification.
Soft Shield Fern
Long soft fronds often with a distinct angular twist along the stems. Forms a large single clump up to 60cm in height and spread, the fronds remaining evergreen in all the hardest winters. Does well in most conditions if not too dry. Award of Garden Merit.
Soft-shield fern, Shield fern
Polystichum setiferum (Soft-shield fern). This is a large fern which has bright green bipinnate fronds about 1.2m long.
They will prefer partial shade with fertile, humus-rich, well-drained soil.
Ground cover, under shrubs