Dark green leaves with cream veining
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I have seen some that was well developed back in January.
I had another look at my pictures and there were lass white veins however the specimen was deep in the bushes.
The leaves are long and thin though and the bases are hardly turned out (=maculatum). We had lots of maculatum out in S Wales in November...
Can you take some pictures of the inflorescences and see what colour the spadix is please? Cicuta58 may be right
Lat/Lng: 54.8, -4.2
OS grid ref: NX6056