Originally Posted by MajorA
Second comment ... lots of these Brit frames were sold either mail order, or through American LBS's as bare frames, so you see a lot of variability in how they're built up. Standard for a Jackson or Woodrup (or Witcomb or Claud Butler or Holdsworth or ...) in the early '70's was all-Campy NR; about 1980 you start to see Shimano, particularly Dura-Ace, and Suntour, either Cyclone or Superbe. The downscale parts on this one suggest to me that you're seeing stuff that was put on there after the original build.
And +1 on some stuff which unworthy1 said; Doug Fattic is one of the guys who posts a lot on bikelist.org, so if you post a question about your frame there, you might get a response from him, as well as some others who have a lot of firsthand knowledge about the marque.
Woodrups were sold in the US before 1980 via several channels: several importers and perhaps even direct. Around 1980, Ten Speed Drive picked up distributorship of the brand and directed some design changes: rack eyelets, a little less laid back, and Cinelli BB shells. I would assume standard parts complement was "whatever the buyer wants." I've seen a few that were claimed to have originally used 27 inch wheels, not 700C.
Road Fan