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Depends what you are using in the garage.
Edit swaping socket for something like this https://www.qvsdirect.com/13a-30ma-rcd-protected-white-single-double-pole-switched-socket
Or using something like this - https://www.screwfix.com/p/masterplug-rcd-adaptor/63731?tc=CA2&ds_kid=92700038959852098&ds_rl=1241687&ds_rl=1245250&ds_rl=1249401&ds_rl=1245250&gclsrc=ds
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.