OP
skamuk
In your case say you we're going to run a lighting circuit off that RCD Spur, you'd fuse it accordingly say for example with a 3A fuse, it also has the RCD function so you are also protecting people from stray shears, pitchforks etc. It's a device used where you would have to meet the requirements of having RCD protected circuits where there is no main RCD so to speak. Similarly you can get IP rated RCD sockets too
Oh ok I understand. So thats unnecessary as the ring circuit is already protected. So I think i'm going to install an 13a FCU In the shed and run everything off of that, making sure that I limit the amount of accessories installed, enough to not blow the fuse when everything is switched on at once. I can't really do much better than that with the money and circumstances put in front of me.
Once I have qualified to level 3 c&g and nvq, part p ect, i will most likely rip out this whole setup and replace it correctly just for peace of mind (and to keep everyone on here happy ) But at the moment this will have to do.
Thanks everyone for your help and opinions. I learned a lot!