From the back cover...
From the chaos of greater London to the majesty of the Welsh Wild Lands and the fey court of Rhiannon Glendower of Snowdonia, the lands of the modern United Kingdom are shrouded in power and mystery. The nobility, megacorporations, and ruling druidic government are all locked in an intricate dance of domination as the land itself fights against the toxic death man has brought her. Here, magic reigns, oppression rules, and the shadows run black and deep. Welcome to the Smoke, term. It's party time.
The London Sourcebook is a reference for the Shadowrun roleplaying game. It details the political, social, economic, and magical power bases of the United Kingdom. Also covered are the streets, customs, laws, and places of interest in London and the surrounding areas.