Not quite Tony, you are responsible for the pipe from inside your boundary, if it's a new plastic pipe then unlikely to be a major leak unless the pipe was faulty or the pipe was not a continuous length from A to B.
If the OP was to turn the stopcock off inside then put a listening stick on the pipe with one end in the ear he/she will hear if there's water running.
A long screwdriver is good, put the sharp end on the pipe.
If the OP was to turn the stopcock off inside then put a listening stick on the pipe with one end in the ear he/she will hear if there's water running.
A long screwdriver is good, put the sharp end on the pipe.