Right, WM! I guess the plugs cost about the same so why is the speaker cable 50 quid pm and the ICs whatever they are - market forces? The gullibility of people like me? I don't needed shielded cables particularly.
One reason I asked this Q is because logic told me to replace my tiny DNM jumpers with spare DNM mains lead instead - bigger, better, far cheaper - perhaps I could use T&E as signal cable.