The Pimlico District Heating Undertaking (PDHU) wasChristine pads across the waxed floorboards of her flat showing me to a comfy spot on her sofa. Her living room is bathed in sunlight, which floods through the windows and reflects off the modernist white of the walls, the brushed iron pipework, and the shining green leaves of her plants. "It's a gorgeous room," I say, and Christine agrees. "My flatmate calls it his studio," she responds, indicating the drafting table on the opposite side of the room. It transpires that her