The Treacle Parkin is a very old North Country Fly – the fact that it has been around so long would imply that is is also very effective
Thread – Pearsall’s Black no 9
Hook – Wet sizes 14 – 16
Body – Peacock herl
Tag – Yellow wool (if using 4 ply remove 1 ply to keep tag in proportion)
Hackle – Greenwell (cock is more usual but I often use a hen hackle since I think this fly fishes better wet). A good graylng fly too.