From the Random House website:
From award-winning writer David Mitchell comes a sinewy, meditative novel of boyhood on the cusp of adulthood and the old on the cusp of the new. Black Swan Green tracks a single year in what is, for thirteen-year-old Jason Taylor, the sleepiest village in muddiest Worcestershire in a dying Cold War England, 1982.
David Mitchell himself says:
It’s about 13 months in the life of a 13 year old boy. It’s set in a small, narrow village in South Worcestershire that the narrative only leaves twice. It’s 1982, in the cold war, and the year of the Falklands war.
Source: The Agony Column Book Reviews.
Knowing that Mitchell is from my neck of the woods, and knowing that neck just as well as he, I’d suggest that Black Swan Green is the name of the village in which Jason Taylor lives, and that the real-life precedent for that village is Hanley Swan. I’m going to have to wait until April to find out if I’m right.