Castles made of sand - Gwyneth Jones

Ax Preston, Sage Pender and Fiorinda, charismatic leaders of the Rock ?n? Roll Reich, have beaten the cascade of disasters that followed the collapse of the former United Kingdom. Now they have to find some resolution to the impossible dynamics of their own relationship, while the world keeps getting stranger. There are fearsome things going on in England?s rural hinterland, and in Continental Europe the green nazis are planning a final solution to desperate environmental damage. But there?s nothing the Triumvirate can?t handle ? until Fiorinda?s father, secret master of powers that are very old and very new, reaches out to reclaim his magical child, the flower-bride.

And that?s when darkness falls over Ax?s England . . .
Harrowing . . . enchanting -- a dark fairy tale with an epic sweep, set in a world very like our own.