A U.K. stillwater pattern, I think. Made a few changes based on materials at hand but the results are similar.

hook - Mustad 9671 #8
thread - Danville 6/0 black
tag - tinsel gold
rib - brown thread
tail - pheasant tail black
body - Swiss Straw cream
rear hackle - hen dyed orange
front hackle - woodduck flank
collar - peacock herl

Part 1

mash barb, start thread 1 eye width back from eye, wrap to barb

tie in tinsel, wrap down bend and back, tie off/trim

measure (hook length) some pt fibers; tie in/trim

tie in rib

tie in a strip of Swiss Straw; wrap body to tie in, tie off/trim

rib body, tie off/trim