The 4 starts at £19,495 for the PureTech 130 petrol motor in entry-level Elegance trim and prices rise to £25,495 for a BlueHDi 180 diesel in its more expensive Prestige format.

The slightly more costly Crossback is simpler still, a four-model line-up distinguished only by engine choices, starting at £21,745 for the petrol and finishing at £26,495 for the same automatic oil-burner.

The residual values aren’t pretty for the DS4, with the Nissan Qashqai and the Jeep Renegade exceeding it significantly

That puts an awful lot of competition – in both hatchback and crossover format – as direct rivals.

For the basic £23,495 price of our BlueHDi 120 test car, you could variously consider the Qashqai 1.5 dCi, the Yeti 2.0 TDI and the Ford Kuga 2.0 TDCi. The entry-level Audi Q3 2.0 TDI, meanwhile, is less than £1000 more expensive than the priciest Crossback.

On CO2 emissions at least, the 4 makes for a worthy adversary. The BlueHDi 120, with a manual gearbox, emits 103g/km, making it the equal of the Renault-Nissan Alliance’s famously parsimonious 1.5 dCi.

Opting for the six-speed automatic incurs only a 5g/km penalty, too, thanks to its lighter and now more efficient design. Even the most powerful BlueHDi 180 emits only 115g/km.

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The pick of the range, though, may well be the BlueHDi 150, which remains at 103g/km despite the extra power and larger capacity. Unfortunately, you can’t have it with the Crossback.

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