Fitting a new ceiling light

[JoeW]

I want to replace a pendant ceiling light with a new light fitting (a 3-light bow spotlight). The instructions that come with the new light, and all DIY books, tell me to expect either 1 or 3 cables. But I have taken off the ceiling rose to find 2 cables. Each of the 2 cables houses a red wire, a black wire and a copper wire.
The new light fitting comes with a 4-terminal block. The terminals are marked L(ive), E(arth) and N(eutral), with the fourth terminal unmarked.
So I'm seeking advice on correct procedure for connecting the 3 pairs of incoming wires to this 4-terminal block. In the meantime I've reinstalled the old fitting exactly as it was.

 

[breezer]

4th terminal is loop in or "spare"

the bare wires are earth and should have green/yellow sleaving, connect the light acros the two blacks*

put the two reds in the 4th terminal

*I assume that the 2 reds are currently connected to each other
and the actula existing light is connected to the two blacks, one of which should have red sleaving or red tape

 

[JoeW]

Thanks, Breezer.
The black wires are both exactly the same - no red tape or markings on either.

++++++++++++++++++++++++++++++++

sorry, should have described wiring that comes with the new light. Going from left to right, the first terminal is empty, the second receives two brown wires, the third a single earth wire, and the fourth two blue wires. Does this make any difference to the advice given?
________________________________
moderator

please read forum rules 10a