Hi Ian,
nice fly. If I may I'd add only that
if these are to be used at proper dark O' Clock then I'd be happier if the wing were of deerhair or something that I knew would still be afloat even after being allowed to 'swing' after a cast or two.
I tied EXACTLY the same fly a couple of seasons ago but in grey, cinammon & brown Aerowing patterns. These caught a lot of fish and never sank, don't look as nice as yours but I guess the silhouette was still ok to the fish.
Everyone needs good Sedge patterns
Iain