Dubbing Blue-grey fur from opossum flank, sparse (pinch)
Hackle Greyish feather lightly tinged brown from a partridge neck (1 feather)
How to tie it
Run the blue silk from behind the eye to above the barb, then forward two-thirds.
Twist a wisp of blue-grey opossum fur onto the silk and wind a slim body over the rear two-thirds of the shank.
Tie in the grey-brown partridge neck feather by its tip behind the eye. The gravel bed is a long-legged fly, so this soft mottled hackle can be a touch longer than usual.
Take 1.5 to 2 sparse turns of hackle, secure, clip the stem.
Stroke fibres back, build a small head, whip finish and varnish.