Also had two leaks...
First one was just inside my boundary wall - the pipe from the meter ran under the wall foundation and then up the wall on the inside. Dug a trench about 6 foot away from the wall and about 4 foot deep to trace the pipe.
There was no way we would be able to dig down another 4 or so feet to replace the original pipe in its old position. The plumber then chased up the outside of the boundary wall and drill through the wall for a new pipe.
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Linked it to the old pipe and switched on the mains...
This happened:
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So they extended the trench and found the source... a t-piece to the garden tap!!
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Re-positioned the garden tap to above the new mains inlet, cut off this t-piece and joined the new pipe directly into the old pipe.
No more leaks!