The Chaterer should have between 200 - 300 small feathers as Kelson mentions. Many however were tied with Kingfisher, I guess for commercial reasons. The same stockists would sell you Kingfisher or Cotinga depending on your price range. The Land & Water and FG both illustrate the Chaterer going over the butt. As they are tied in the modern fachion they are way too thin. Guy put approx. 200 feathers in his one and I think I did the same.
From what I understand, from what I have been reading so far, Chatterer has always been in short supply. So to tie it with Kingfisher would have been the only option in many cases, I guess.