As I slowed for traffic backed up from a set of lights, a black blur, slashed through with the icy white glow ... The S5 is a good car but perhaps only as good as Audi wants it to be.

It’s not the new S4 – the A4 model name has been reserved for an electric car (even numbers are now EVs in Audi world) – except it is. It’s not the same as the old S5, because that coupe ...