As Carlos Ghosn and Dieter Zetsche swept into the press conference to announce their strategic partnership they brought with them a sense of calm - albeit one followed by a baying throng of pushing and shoving photographers desperate to capture a moment many thought impossible.

Before their arrival there was a bizarre feeling of uncertainty about proceedings. Renault, Nissan and Daimler staff stood alongside one another, meeting, greeting and cajoling visitors in the right direction in three widely different styles that seemed to underline their varying company heritage and working practices.

If that felt disjointed, the release of the partnership announcement half an hour before the official conference did nothing to improve matters. Such had been the secrecy surrounding the deal not even people working for the companies involved knew the details - press officers were as keen to read the release as the journalists.

It was welcome, then, when Ghosn and Zetsche brought some authority and knowledge to proceedings. A quick introduction and they were off, Zetsche first, business-like, then Ghosn, perhaps a little more laid back but just as commanding.

Then on to questions from the floor. Again, these two are too smart to slip up, but there were a few veiled comments, admissions and omissions.

Ghosn dropped in that talks began when Daimler approached Renault about developing the next Smart, underscoring who'd asked who on the first date. Zetsche conceded that Daimler was in need of some small car knowhow and a lower average CO2, and Nissan wasn’t even mentioned as a stand-alone brand until 13 minutes in - which may tell you something about where the focus of the deal lies for now.

And that was that. It was time for both men to go, and for the information they had imparted to disseminate around the world, easing the mood among the new Renault-Nissan-Mercedes colleagues that seemed a touch uncertain earlier on.

Whether car buyers will be as soothed by their words remains to be seen - no doubt the Autocar forums will provide a good barometer of that.

Make no mistake, though - we'd better get used to days like this. There may have been unease in the air early on, but both Ghosn and Zetsche were unequivocal in their belief that partnerships among car-makers are the only logical way forward, both for driving down costs and opening up new opportunities - especially in bringing electric cars to market.