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If the garage power is already a spur then you are not supposed to take another spur off of that spur.
A lot depends on budget and the use case for the garage. If you are planning on a decent well used workshop type garage and you have the money to set one up then you are probably going to get a professional electrician to do it for you.
If like most people you are not going to get enough time to spend in the garage on your household projects or fill your garage with light industrial tools like lathes etc. then you could stick with the current setup and add an extension from the house which is a simple 13 amp plug socket with standard extension cord, as long as it's not fixed wiring it doesn't come under the regulations.
Airhead-
If the garage power is already a spur then you are not supposed to take another spur off of that spur.
You can spur off a spur but you need to put a 13A fuse between them. You are effectively doing the same thing when you plug in a 4 way extension lead.
It's not ideal though and extending the ring is a safer and better idea.
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I'm not sure if I'm reading this right but are you saying the two main options are:
A: do it properly via a qualified electrician
B: run a temporary extension cable from the house when I want to do work?
Why couldn't I just run an extension out of the single socket already in the garage?
Mr_Sworld
fizzy.bleach
that's very helpful, thanks. I have read up on RCD-protected sockets for gaarge outdoor use, and you post seems to echo what i've read.
reading between the lines, you seem to be suggesting working with the existing garage supply. my temporary fix would be to run everything off the one existing socket. is it feasible to DIY-add more (and lights) without incurring too much mither on my end - in terms of difficulty, safety and admin?
from memory, the consumer unit was inspected in '05.
garage power seems to be a spur off the kitchen socket ring.