I'm not a fern expert but it looks very like one I have Dryopteris Affinis 'Cristata The King'
One of my favourite ferns :-)

Asparagus setaceus is the botanical name for Lace Fern.

Looks very much like another I grow Dryopteris dilitata Lepidota Cristata. Billed as semi evergreen but dies back each year in my garden. It's usually quite difficult to put a specific ID on a fern.

Scottish: I certainly agree that it really is quite difficult to give a fern a specific ID.

After looking at loads of photos online, I HAVE finally settled on a Dryopteris but it's d.filix-mas 'Linearis Polydactylon'. (probably wrong!)

Thanks everyone for your help.