Well - it's like this you see.
My initial assessment was that the outer had broken right at the end of the inner/lower section. Pole could still be adjusted and I could shorten it to finish the trip by simply sliding the inner further in and relocking it. Easy.
When I pulled it apart i discovered that I had actually broken the inner as well.So the break was at the strongest part of the pole.
Aaany how. I plan to fix the inner with a hardwood plug. Needs to be approx 11.7mm dia. Nearest that I can find is 12.6, but at least I have a couple of people who can turn a length down for me - at there leisure

Once that is sorted, I'll turn my attention to the outer.
As I have a spare assembled from bits, the pressure is off, but the repair is going to take a while.
These things are so *&%$#! good (for me) that if I had no choice, I would buy a replacement. The light weight means they can be in your hands the whole time. Even holding them horizontal by the grips isn't tiring or annoying.