Leaking pipe to a garden annexe
The property
A chalet bungalow with an annexe in the garden for a parent, fed by a plastic branch teed off the main supply beneath the lawn.
The problem
Anglian Water's letter about round-the-clock use was the first anyone knew. Both owners work in Norwich, the lawn looked normal and neither building showed damp.
How we found it
Shutting the house stop tap left the meter turning, and the annexe branch failed a pressure test. Plastic carries little sound, so we fed in tracer gas; it surfaced halfway across the lawn, where a faint hiss agreed.
The outcome
A neighbour let us in. One patch of turf was lifted and the split joint replaced during our visit, for the figure agreed before we began.