The defining trait of the newest addition to the Volkswagen Golf engine line-up is subtlety. At a time when Volkswagen is making bold statements about its electric ambitions with its advertising campaign for the ID 4, the addition of a 48V mild-hybrid system to the Golf’s entry-level threecylinder 1.0-litre turbo petrol is so subtle that you’d barely notice it. And that’s not intended as a criticism.