Hello I am new to this forum and need a little help from an experienced spark to help me design a circuit to wire a detached garage (two sockets and ceiling lights) from a house ring main to 18th edition standards. This will be notifiable so everything has to be pukka. Cable can be in steel trunking or armored but prefer steel trunking option. I do know the basics but as this is my first outbuilding wiring I would really appreciate some pointers. My idea is to replace a socket in the house to a switched 13 A FCU drill through wall to outside and use steel trunking buried under garden slabs to garage wall. Drill through garage wall and connect cable to an RCD (thinking that a mini CU is overkill) as the house CU doesn't have RCD protection. At this point not sure of best option to split garage supply to sockets and 3 amp protected lighting..... Thanks for your help.