Confidence: I'm as sure as I can be.
Notes: Although we annot see the basal pinnae which are very diagnostic, the upwardly curving pinnae and the spines at the tips of the pinnules and along the margins of some suggest P. aculeatum. It is possibly the hybrid P. x bicknellii, but the spacing of the pinnules is rather too close together I think. In its favour however is the fact that almost all the punnules are stalked - a P. setiferum character. I would like to see the complete frond shape and know its size before moving away from P. aculeatum to the hybrid.