The debate around whether the modern world needs motor shows is under the spotlight this week in Paris, with Bentley, Ford, Lamborghini, Mazda and Volvo among the big names who would traditionally have pitched up electing to give the whole jamboree a miss.

The theory goes that motor shows no longer deliver bang for buck; why fight for airtime for your product with 27 other car makers when you can get more coverage and more eyeballs for a (cheaper) digital reveal away from the melee?

Read about this year's Paris motor show here

On the eve of Paris, the motor show cause has been delivered another blow - albeit from the head of one of the car making conglomerates that is actually there. Having skipped last year's Frankfurt motor show while he negotiated with the workers' unions in the States, Fiat Chrysler CEO Sergio Marchionne, has cried off at the last moment again.