The blueprint for the future of Formula 1 beyond 2020, at least as presented in the bullet-point summary released during the Bahrain Grand Prix weekend, reads like a utopian vision for grand prix racing. Pretty much everything makes a lot of sense, and if one was to create F1 out of nothing, this would be a good starting point.

The problem is that F1 does not have the luxury of a blank page - it has to deal with decades of accumulated baggage, and with 10 teams whose priority is, inevitably, to defend their own individual interests.

So, what are the biggest challenges that Ross Brawn, Chase Carey and their colleagues will face in the coming months as they try to get everything signed off? And how much room is there for manoeuvre?