I have 4 cables coming down into my rose.
1. 2 red wires (switch)
2. 1 red wire, 1 black wire (supply)
3. 1 red wire, 1 black wire (supply)
4. 1 single black (unearthed)
Step by step, and using the ban-all-sheds diagram in the reference section "REPLACING A CEILING ROSE WITH A LIGHT...