My leak seems more obvious. With my stopcock off the little wheel still turns so my leak is between meter and stopcock. As the distance is some 30m I do not fancy digging up 30m of ground to find it, maybe in summer if we get one!
The problem quoted should be fairly easy to solve with a bit of logic as has been suggested by other contributors.
There are techniques for pin-pointing buried leaks where digging is going to be expensive, for example:
How to Find Leaks - Understanding Acoustic Leak Detection
What one often finds is that the leak is either withn a foot or so of the meter or stopcock. If not the pipe probably failed because it was an suitable type and/or was not buried correctly and so the whole lot needs to be dug up and redone properly anyway.