fused radial off a final circuit

[CERTA]

I have been asked to wire a garage its an new dwelling ,the client is wanting to change the garage into a dining room / play area for the kids , in the garage there is already a double skt but its half way up the wall it will pull back and could be used for a wall mounted tv skt , is it possible to radial off that final circuit fuse it down to a 13 amp and then put the rest of the skts in , its just the rest of the house is all decorated ,am i living in hope or is it possible cheers certa

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