Just a bit more on the pattern...
Had a peep in Moderrn Trout Fly Dressing - Woolley and it gets a mention as Tommy's Favourite.
However it is also known as Tommy's Fancy.
Both names appear in Angling with the Fly - J N Watson and is noted as follows......
"This pattern was tied for and dedicated to a friend of Roger Woolley's, Major T H Oakden of Rolleston-on-Dove. With this pattern and the White Witch, the two anglers took 103 grayling in a day from the Okeover Club stretch of the Dove at the invitation of the then waterkeeper Gregor Mackenzie. The fly was also popular on the Manifold in the 1933's, another river fished by both men."
In both books the dressing is recorded as:-
Hook: Sizes 00-1
Body: Quill from a yellow blue macaw tail feather, the yellow to show as a body and the blue flue as rib.
Tag: Red Floss, tip of silver under tag
Hackle: Medium Blue Hen