Furled fern

Had a wander round the garden again this afternoon to see what effect all this rain has had on things.
The blackcurrants are a bit sparse this year, maybe get one good smoothie out of them but that's all :(
The hydrangea is coming along but the most noticeable change is with the ferns; they are enormous and seem to have sprung up in the most obscure places. I like the enormity of them but my favourite part are the little curled fronds that creep up shyly from underneath.
I'm trying to find out the name of the species so if anyone knows...!