Hi, the fact the next light has stopped working indicates a loop-in wiring method. if you temp. connect brown wires together and blue wires together in 2 connector blocks the next light should work. The 'large black wire with brown centre' could be the switch cable which may be a twin brown type as should be used for switch drop wiring. To confirm how many cables you have, with power off, remove earth sleeving and see how many actual wires are inside, it should be 3, have another look and reply please,
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