Could someone do me a simple wiring diagram for the easiest way to wire these up. Existing light has terminal block with circuit cable (black,red and earth) in and out (6 wires) plus switch cable (2 lives and earth). Should I replace this with a four way junction box, make same connections, then run live neutral and earth from junction box to first downlighter then second and so on ? Does the cable have to loop back in to the junction box or can it finish at the last downlighter like a spur? Also I have 2 zone one lights which have an earth terminal and 2 zone three which don’t, why is this? Both fittings are metal. Should I fit an earth to the zone 3 lights? they are from Wickes if that helps. Thanks in anticipation