help needed to fit a new chandlier to a loop system
It looks like a fairly standard UK or similar ceiling rose. Therefore, of the top 3 blues, 2 are loopthrough and the fitting connects to the other. Of the 3 browns, they are also probably loopthrough plus a feed to the switch. Of the bottom two wires, the blue has a brown sheath so I would guess it is a switched return and the fitting connects to that. The earth block (green/yellow) would be connected to the earth on fitting. It doesn't look like it is connected at the moment; because of this, I suspect the white cable leads to a double insulated fitting that doesn't require it.

Your new chandelier appears to have a metal boss / stems, so the
 earth is now required. You shouldn't need the choc block connector, so wire directly to the rose fitting as a direct replacement of what is there. Obviously - you'll need to turn off the lighting circuit breaker and check it's safe before proceeding with a meter. How you fix the cover plate up is up to you.