::: This is a discussion about how to improve the article. There is what appears to me to be a dubious claim. No doubt the solution is to amplify or reword the claim. Allow me to explain my "dubious" reaction further, and perhaps you will be able to do that.  

 ::: The article currently states that a ring circuit needs less copper to supply a given current to sockets fed from a single fuse or breaker than would a typical US-style branch circuit, and I'm just not seeing how this works. I daresay I'm just as familiar with the principles of resistance, current, ampacity of wire, etc. as the engineers of 70 years ago (this is EE 101 stuff; I passed EE101 and 102 (AC circuits) by exam with a score over 95% without ever attending a class or even looking at the textbooks). In terms of the amount of copper needed, ampacity scales linearly with the cross-sectional area of the copper. (There are other concerns like insulation heating which don't so scale, but we're not talking about that, we're talking about copper savings.) So you need 2x as much copper to provide 30 amps as to provide 15 amps. It doesn't matter if the 2x comes from using a single cable with twice the cross-sectional area in its conductors, or from two 15-amp cables in parallel; the amount of copper is the same. 

 ::: I noticed that the article you linked in IEE Wiring Matters does not actually say it saves copper. It rather unspecifically refers to lower costs. Now I am quite willing to believe that there is some other factor at work that does result in the use of lower costs (the physical arrangement of a typical building and the sockets within? Does the cost of the wire not scale linearly with copper content, so that 2x the copper in the form of two runs of thinner wire is cheaper than one run of 2x the copper thickness?), but I hardly think I am the only reader of this article who would like this explained.  

 ::: That article, by the way, closes with a summary of BS 1363 as "truly unique, innovative, world class system was developed by people of vision. A system that cannot be equalled in terms of safety, performance and convenience." Doesn't seem particularly "balanced" to me.  

 ::: Speaking of safety, a ring circuit as described would appear to have a safety disadvantage.  Suppose one side of the ring develops an open in the line or neutral path. All sockets on the ring would then be fed by wire having a total ampacity of considerably less than the fuse or breaker at the origin of the ring. If this problem is addressed in BS 1363, the problem and its solution should be described here.