The social commentary that drives the plot.

The Gold-Tier: Homes in [[Mayfair]] have "Perfect Resonance." The lights never flicker, and the tea-urn never whispers.

[[The_Gutter]]-Tier: Council houses in [[Croydon]] share a "Communal Ward Stone." If your neighbor uses too much magic to dry their laundry, your heating goes out.

The Ninth Knot's Offer: They offer "Free Signal Boosters" to the Gutter-Tier. In reality, these boosters are Packet-Sniffers that let the [[Ninth_Knot_Syndicate|Syndicate]] see everything you do behind closed doors.