Here are Skues comments on the Fieldfare -
"Felfet or Feltyfare. - See Fieldfare.
*Fieldfare (Felfet, Feltyfare, Blue Back, Jackbird). - The primaries and secondaries of this handsome bird make excellent wings. They are , however, much neglected in this country ; they are of a blue-dun colour.
The late David Foster recommended them for some of his Derbyshire patterns, and Mr T. E. Pritt, in “North Country Flies,” gives a pattern of “Fieldfare Bloa,” winged with a soft feather from the rump, and Jackson gives a spider legs similarly winged. In Scotland the bird is highly prized. There is no apparent reason why the shoulder knob feathers should not be used as hackles. As alternative wings for his Fieldfare Bloa, Mr. Pritt offers (1) tern, (2) “blue tail,” and (3) jay; but the rump feather is both browner and dustier than any of these."
This is the best info on Fly Dressers Birds
http://www.dtnicolson.dial.pipex.com/page81.html