Electrical – How to wire a double wall light

I would like to install a double wall light where I'm told there used to be one previously. However, the wires in the wall and the wires of the light are both confusing me, and I'm not sure the best way to connect everything up. I have wired lights to a wall before, but it was a simple live to live, neutral to neutral etc., and this has a lot more going on. This question is in two parts.

Firstly, the double wall light arrived with the wires arranged like so:

There is a live and a neutral wire running along the arm of each light, and a single earth wire. The wires have already come twisted together like this:

Is this correct? Should the live and neutral for each light be twisted together? Or should both the lives be twisted together and both the neutrals be twisted together?

Secondly, this is the state of the wires coming out of the wall:

It looks as though a cable has been cut, and then both lives twisted together, both neutrals twisted together, and both earths twisted together, to allow the wires of a light to be attached. My second question is, do I leave these twisted together when I install the wall light? Do these need altering at all for installing a double wall light?

Since the wall is in a bit of a state from the previous owner I am considering hiring a professional for this one, but wanted to have a go myself first. If someone could tell me just how the wires should be for this installation I'd be very grateful, I can't really find any diagrams of how to do it online through Googling. I can provide any extra info if requested.