They by Kay Dick

This is Britain: but not as we know it.

THEY begin with a dead dog, shadowy footsteps, confiscated books. Soon the National Gallery is purged; eerie towers survey the coast; mobs stalk the countryside destroying artworks – and those who resist.

THEY capture dissidents – writers, painters, musicians, even the unmarried and childless – in military sweeps, ‘curing’ these subversives of individual identity.
Survivors gather together as cultural refugees, preserving their crafts, creating, loving and remembering. But THEY make it easier to forget …

(Faber)