The lesson of two decades of frantic M&As in the motor industry is that acquired brands, however strong and attractive they might appear, take years to restore. They first need refreshing, then bending to the shape and behavior of the new family. And they need to be refitted with the new products worthy of the badge on the front.

GM’s unhappy cohabitation with Fiat was concurrent with its ownership of Saab, which it bought as a consolation prize when it was beaten to Jaguar by Ford. 15 years later that, too, looks like a mistake. A frantic upgrade program is underway to reduce costs through platform and component savings with other members of the GM alliance group. But using the corporate parts bin is a quick way to cheapen a brand.

And then there is Volkswagen, pride of the European predators. It used acquisitions to expand geographically – first southwards to acquire SEAT in Spain, then eastwards to take over Skoda in the Czech Republic. In parallel with a masterful 20-year rehabilitation of Audi as a prestige brand, VW also snapped up Bentley and Lamborghini from their distressed owners.

Bentley has been a fabulous success with its Continental coupe. Lamborghini has a couple of new street racers that look good but have not yet turned a profit. Critics want to know how VW will cope with Volkswagen, SEAT and Skoda brands all fighting for the middle market and competing with each other, and what it can do to recover from the recent slide in the share of the American market, where only a few years ago it was zooming ahead. Expected job cuts in Germany, maybe up to 10,000 of them, will not begin to address that problem, but might provoke damaging strikes.