I see two possibilities. Obviously for both that snipped wire needs a proper join putting in.
The way you suggest will work fine as long as he is happy to run a CW1308 grade twisted pair wire (proper telephone cabling) between the kitchen and living room. It needs to be from a reputable supplier from such as RS Components (who do sell on Amazon) as there are plenty of cheapo low quality or non-twisted flat imitations than claim to be CW1308.
It is important to use one of the twisted pairs between the two sockets. For example blue or blue/white with white/blue. Blue or blue/white with anything orange or green or whatever would be using a "split pair" and cause disastrous interference.
What I might do would be replace the box in the roof, assuming it is inside not on the eaves outside, with an NTE5 master fitted with an NTE5B faceplate instead of an NTE5A. (The NTE5B is a blank plate with no socket but with the IDC connectors on the back). Both the sockets could then be run from the IDC connectors on the back of the NTE5B. That's as long as it isn't already an NTE5/NTE5B and we are up the wrong tree
as to what the problem is. Note that the same applies to your method, if it is an NTE5/5B
One of the two current sockets is probably an LJ 2/1A (master) and the other an LJ 2/3A (extension), see this page
. The difference being the cylindrical capacitor at the top. The LJ 2/1A should be replaced with an LJ 2/3A in my method. In your method it is the LJ 2/1A that should be wired from the loft.
In all cases he may choose to fit filtered faceplates for neatness, such as the ADSL Nation XTE-2005 for the NTE5 if he does it the way you suggest, and the XTF-68/85 for extensions. (The 68 and 85 are the sizes of the possible backboxes). Clarity and Solwise are also recommended suppliers of equivalent kit.
I expect you know an IDC/Krone tool
is a good idea for inserting the wires.
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Edited by RobertoS (Wed 16-Jul-14 19:26:41)