Well told Andre! I can see it all, having been there many times... I was anticipating something happening again at the hold water down at the end of the run as your story came to it's undaunted ending. Could a break at at that location be an indication of a problem of over-stoutness on the complementary ferrule?
I'm sure you've taken all the typical Spey ferrule precautions of paraffin waxing or electrical tape per Vincent, Brown, et. al. The torsion is vicious on ferrules during the Spey stroke.
I'm knocking on wood... the one and only break out of the five Spey rods I've owned has been due to a young boy and his dog rumbling on it over some river stones. I forgave my son and the dog's still alive.
Thanks for the lucid description of your morning on the Sky, I look at that image often for inspiration toward my upcoming visit.