Nymphing for salmon is a popular and exciting method on chalkstreams and this fly is one of the best. If you can see the fish, bounce the fly in front of its nose, then raise the rod-point to induce a take. Fish it on a 9-10ft 7wt rod. 

Material list for the Marabou and Peacock JW Nymph

Hook: Size 6-8 Kamasan B175

Thread: Red

Beads: Two metal beads, preferably tungsten

Underbody: Lead wire along hook shank 

Tail: Black marabou, peacock herl and Mirror Flash tinsel

Body: Twisted marabou and peacock herl

Rib: Silver wire