Perhaps unsurprisingly, my original post appears to have been deleted (unless I've missed it). Not surprising to me because it got hijacked by a collection of several selfish self indulgent individuals who had never listened to the cables in question and therefore had absolutely zero to contribute to the debate. These individuals can feel free to start their own post about their scientific supremacy, but leave me and the rest of us who trust our ears in peace. Perhaps the mods could sort this out.
So in my home today listening with an Atom and Totem Tribe In-Wall speakers (second system) we went from bog standard CAT5 to Chord Epic to Chord Signatue to Chord Sarum T. At this point we kept the Sarum T from Atom to home network and used the Signature to connect the NAS to the home network. And then we reverted to the original bog standard for both.
There was a clear and broadly speaking roughly similar improvement as Epic, Signature, and Sarum T were substituted. With the standard CAT5 the Music sounded somewhat muddled which Epic resolved . Signature added fluidity and effortlessness, and Sarum T simply raised it all again in every way. Dealer and I agreed that any improvement adding a posh cable between NAS and network was very marginal.
So my head says Signature, and my heart Sarum T. Definitely better (although Signaure very good), but one posh cable rather than two+ Is something I can afford, or I suppose Shoreline is an option for the NAS.
PS If I follow correctly there was some sort of challenge submitted. Subject to agreeable conditions etc I am 100% up for it.