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You have (I think) three cables coming in there, one for the supply coming in, one taking the supply to the next light in the house and one going off to the switch (and back). This is standard in the UK but not done in many other countries, and your instructions are written assuming the latter - i.e. that all of this complexity happens somewhere else and you only have simple connections for the light in the ceiling.
You need to recreate all of those connections if you want the switch and the other lights in the house to work. So your options are either to wedge some extra connectors in the base of the other light, or reuse this base.
Another lighting question -
I want to install a new pendent ceiling light to replace an already installed pendent and I’m trying to work out of its a DIY job or try to find someone to do it.
The photo is what I see when I unscrew the plastic cover on the current pendent. The instructions on the new light say that no Earth must be attached and it has a junction box with just Live and Neutral terminals. So is it a case of removing this entire assembly, wiring the Live and Neutrals to the other end of the junction box and then what with the Earth?