On Wednesday, 10 April 2019 18:44:26 UTC+1, TimW wrote:
Simple question: Should the braid be connected to anything? The back of
the wall plate looks like a connector for the central copper wire plus a
clamp for the cable. does the braided sheathing need to be connected
through to the telly???

The clamp goes onto the braid, ie the outer sheath has to be removed.
Make sure the braid doesn't short onto the central solid wire.