In reply to Alex Riley:
What I want to know is, who can trace the earliest instance of the claim that some part or the whole of the UK is 'climbed out'?
It is true of course that with the odd notable exception, it is generally diminishing returns from a finite resource.
One day, when the billionth contrived link-up eliminate variation has been claimed on the last knee-high boulder on a remote skerry that is only uncovered at a low spring tide, the new router can down his brushes and the era of the coveted second ascent can begin.