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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.
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.
Mr_Sworld-
Even cowboy me would run anything but the bare minimum in the garage.
Maybe run cable back to the start of the spur to make it part of the ring main, but then..... How far is the fuse board from the garage?
I don't like the look of surface mount, it looks cheap and jobs don on the cheap. Then I have seen (in France) some surface mount conduit that looks like skirting board and that I do like as it is unseen.
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I tend to forget about it as an option, you're right though, technically you can.
lynx
Airhead
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.