A ceiling light bulb flickered out of use but was OK in another light, so I turned off the mains and unscrewed the fitting. The part that screws into the ceiling had 34 years of dust and gunge in it and as I was cleaning that out the "bulbholder", or what the manual calls the lampholder, came off in my hand - honest, the terminal screws were that loose.
So I have:
a green earth wire still connected to the ceiling fixture;
two red live wires twisted together at the ends;
two separate neutral black wires;
and a lampholder with three terminals, two of which obviously relate to the contact studs for the bulb.
If there was just one neutral wire I'd stick it and the two live wires in the obvious terminals - but what about the other neutral wire?