One supply pipe, three cottages, one letter
The property
A short row of older cottages in the middle of town, sharing one supply pipe that runs behind them with a branch into each kitchen.
The problem
The end cottage had a letter about constant use. All three households had checked taps and toilets, and nobody knew the shared pipe's route.
How we found it
We asked all three households to close their stop taps, and the dial kept moving, which put the leak on the shared pipe. Tracer gas surfaced behind the middle cottage, and the ground microphone agreed.
The outcome
We marked and photographed the spot. The three households could then use the report to agree the repair between them and reply to the letter.