Guess you already got one recipe. A quick look at the first two pages of Alta Vista search results yields several more. Obviously your friend isn't going to be using a mush of the fermented plants as a dye bath, so there's a high limit to that. As for the alkaline treatment, a search on {woad and ... well, not to offend - water} yields 104 hits. Delicacy forbids noting why laws were passed against woaderies(?) being located close to towns or why woad people tended to intermarry, but anyway, there's something of an upper limit to that as well, either for a solitary dyer or one with N cooperative friends and limited access to mundane lime-water. Not much help, probably. No time to look up either the humorous bit on woad in The Dogsbody Papers or the touching Wall Street Journal account of the passing of the last woad farmer in Britain (fittingly drawn to his reward on the old woad-waggon). Didn't spot any blue on the barbarians in the opening scenes of Gladiator, either, though far from being endemic to Britain, the plant appears to have spread across all of northern Europe from Russia etc. bk--- unwilling to spend another $7.50 to see the movie a second night running just to double-check what I recall as a dubious inscription above the entrance to the Colosseum. Anyway, their consultant (way down in the credits) would never have missed it. But would she know the vernacular Latin for "I love the smell of napalm in the morning."?