[Closed] Traffic Lights and the green man.

I'm with TJ on this. The Highway Code may refer to lights not working - but neither the RTA or TSRGD refer to "not working" in the sections you cited or elsewhere. What they do refer to is defines the correct character, size etc of traffic signs/lights (but not how they are triggered). Therefore what it seems to say to me is if its not illuminated it is no longer a valid traffic sign.

if you want confusing, then try the crossings / lights around the Canon Street/King William Street/Eastcheap/Gracechucrh Street in London. It's a real treat for first timers