Hook - Daiichi Model 1710/Size 14
Thread - 6/0 UNI-Thread (Black)
Tail - Peruvian Wool (Yellow)
Body - Peacock Herl (reinforced in a thread dubbing loop)
Hackle - Hungarian Partridge Hackle (prepared and tyed in by the tip)
This fly is a simple variation of a classic soft hackle pattern.
Additional background on the "Treacle Parkin" ("A Guide to North Country Flies" by Mike Harding/Page 101)
"A famous North Country grayling pattern, though it seems just as attractive to trout, particularly when there is some colour in the water. Parkin is the treachle-flavoured cake made around Bonfire Night by generations of Lancashire mothers. The fly is usually tied dry using a ginger cock hackle. This fly is a killer on dull days and when fish are lying deep with little sign of movement on the surface. It is just possible that the fish mistake this fly for a piece of cake."
Mr Harding lists the recipe as follows:
Thread - Pearsall's Black 9
Hook - Down-eyed Wet 14-18
Body - Peacock Herl
Hackle - Greenwell or light furnace hen
Tag - Yellow or orange tapestry wool