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I currently have a double socket in our spare bedroom and a 4 way extension block running a computer and peripherals. For neatness I would like to have an electrician add a second double socket right next to the existing one and do away with the extension block. The socket can be added to the existing ring main.
Just ask your electrician to install a short bit of 20mm or 25mm galv conduit in between the two socket back boxes bedded in the wall (a coupler would be easier). This is well within the Regs and is listed in the Regs itself. The new socket plate can be an RCD or none RCD one, depends upon its use. In your case, you do not need one (but it is advisable). As already said above, a surge protection extension lead should be used if for computer equipment, common sense.
Protection for fixed wire installations for cables less than 50mm from finished surface should be RCD protected OR adequate mechanical protection (galv conduit) OR surface mounted.
Its only an extra socket and even in London would cost less than £150 (should be anyway???)