To declare my prejudice straight away, I don't normally approve of these kinds of BMW M Sport models. As you may know, M Sport is an enhancement package offered on many standard BMW models. Ignore the marketing fluff and the point of M Sport is really to make an ordinary BMW look a lot like a proper M-car.
That's pointless, because it fools nobody. Those who know their M-cars know the difference. Those who don't probably aren't impressed anyway.
Anyhow, I can't help approving of the BMW 125i M Sport. Because there isn't currently a 1 Series M-car anyway (the 1M coupe is the previous-generation model, remember), the 125i makes a monster 160kW from its 2.0-litre petrol-turbo engine and the One is small and cheeky enough to pull the whole thing off, even in the Estoril Blue finish of our test car - the same "hero" hue used for the international launch of the M5.
If you want a 125i in New Zealand you have to take delivery in M Sport guise; a standard model is not offered. The lesser 1 Series models are served up in Urban and Sport guises. M Sport is a level above the latter, with an aerodynamic body kit (including bespoke bumpers), sports suspension, special seats finished in a grippy cloth/Alcantara combination, 18-inch alloys and detail trim differences in the cabin.
The 125i's 2.0-litre engine has an odd diesel-like tick at low speed that fails to inspire. But the TwinPower turbo is astonishingly linear - so much so that you may not be sure it really does have forced induction. I will confess to popping the bonnet on it straight after writing the previous sentence, just to check. It does.