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It depends on what is in the circuit. A B22d bulb holder is often rated 2A but in theory there should be a built in fuse in the bulb so that does not reflect on supply fuse size. But a ceiling rose is used as a junction box and only they are only rated either 5 or 6 amp so they will limit the size of the supply MCB/fuse/RCBO even using some 5A connector strip.There is no requirement for a lighting circuit to be protected with a 5/6A device.such a circuit should already be fused at 6A.
So although if suitable components are used you could protect up to 16A in the main suitable components are not used so yes should be fused at 6A.