Another week, another kick-the-Brexit-can-down-the-road move by the apparently paralysed UK government as a humiliated Remainer prime minister shuttled to various European capitals and Brussels before a small-hours announcement that, er, nothing had been achieved apart from yet another extension. You can imagine how the automakers who brought forward summer plant shutdowns or stockpiled a few parts just-in-case just-in-time was interrupted temporarily must have been feeling.