Leaf mine of Phytomyza hellebori in Helleborus foetidus. Probably very unrecorded judging by NBN map. Mines very conspicuous in the winter.
No interactions present.
There is no national recording scheme for leaf-mining flies at the moment, so the records aren't being collated anywhere as far as I know, hence the lack of info on the NBN maps. (There is a recording scheme for leaf-mining moths, but as yet it hasn't sent its data to NBN, so they look a bit patchy as well!)
Entomologist and biological recorder
I have seen this type of damage on Hellebore in Hampshire too.I'll keep my eyes peeled for more
Lat/Lng: 51.9, -2.1
OS grid ref: SO9324