Cracking fly there Stuart, and a nice photo. I wish I could tie crow wing that nicely, mine look like crep compared to that.
Here's what I like to use, I had a good crack at hairwings but there's something nice about a feathered wing, they don't wrap around the hook like hair does which is a confidence booster.
Hook Size 10 Partridge Wilson lightweight
Thread - Black Sheer
Tail - Golden pheasant dyed red
Rib - Silver wire
Body - Silver tinsel and red seals fur
Hackle -Black cock
Wing - Bronze mallard and JC
I call that one the Aberkicker, it has a few years to go before I've notched up a hundred with it though.