For years, the arrival of Chinese car brands in Britain was treated as something of a curiosity. There would be talk about low prices, huge screens and long equipment lists, followed by the usual question: yes, but are they really any good? That question is getting harder to ask with a straight face.The latest car to make the point rather neatly is the Chery Tiggo 4, which I’ve spent some time in recently. While it is far from perfect, I came away thinking that cars like this must be giving the established names a fairly serious headache. Why? Because the…