The UK 'single' or 'internal' market is, whether you like it or not, a thing, and a fundamental provision in the Constitution. Nothing 'contrived' about it whatsoever, unless you consider the Acts of Union to be contrivances, which on reflection you probably do.
As for your gleeful asides about the Spectator, I guess you'd know. Unlike toi, I very, very rarely read it. I wish I had time. Rod Liddle was always fun in his effortless
dismantling of the kind of hypocritical libleft bullshit in which some people so smugly bask, don't you think? It takes a lefty to know a lefty, you see.