The cores and sleeve colours pictured (pic1), indicate you have a switch line( black core, sleeved brown), a permanent live(brown core), a neutral(grey core, sleeved blue) and a CPC/Earth (yellow/green)
So what exactly was disconnected from this and does the switch for the original fitting operate anything else? As this is not a standard wiring set up, for a ceiling rose that is a simple on/off function. Do you have a means of testing for voltage? Something that can test two conductors, not a neon screwdriver please!
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