[Lynn Eades]

Disconnect the cable at the bottom end.
The cable has a spring steel support at the bottom end. The bottom of which hooks into a hole in the end of the outer at the diff end. Unclip it.

This then allows you to slide the nut up the cable a bit, and it exposes a washer type clip. Slide that out to the side (mine is a tight fit) and then you should be able to pull the inner up from the top end.
This is part of an early British UC cable> I do not have the top end of it, so my instructions are a compilation of what I have, and what Rob said.