Wet ceiling below a flat nobody was using
The property
A first-floor flat in an old brick warehouse turned into homes, with concrete floors laid at conversion and a second home above.
The problem
A stain crept across the living room ceiling while the flat upstairs stood empty, and the agent could not say whose pipe was to blame.
How we found it
Readings below pointed to the kitchen upstairs. With the agent's key we tested its fittings in turn; the dishwasher supply, run in the floor behind the units, failed, and tracer gas confirmed the point.
The outcome
Once marked and photographed, the point went into one report for both owners and the agent. The repair upstairs was quoted on its own.