Talking about MCBs, i have just had a split load cu installed and was
going to use the split load to power my outdoor circuits in my
outbuilding. i plan to have a 6a mcb on the rcd side taking power to
3 lights, and a 32a mcb taking power to 4 sockets on a ring main. Is
this the correct way to do it? as i have read that a 16a mcb should be
used for outdoor socket circuits.

I ask this question as i have just read above that a rcd protected mcb
should not be used for outdoor lighting.