What is the author's style in The Wasp Factory: A Novel by Iain Banks?

The story of "The Wasp Factory" by Iain Banks, takes place on an island off the coast of Scotland. Therefore, there are some words and phrases that, while English, are not common to an American readership. For example, "firth" (earth or grounds); "Kickers" (pants); "steelies" (marbles); hitching lifts (hitchhiking).