What's all this about?

It's a Bugatti Chiron with more speed.

Come on - seriously?! MORE speed?!

Well... kind of. Truth be told, the Bug's monumental 8.0-litre, 16-cylinder, quad-turbo powerplant remains unchanged for this new model, which is called the Chiron Sport. But when that blesses the, um... standard car with 1,500hp, 1,600Nm, 261mph and the ability to run 0-62mph in 2.5 seconds - despite it weighing 1,996kg - then more power was really not what the Chiron needed.

So if it's faster, but not any more powerful, then presumably the Sport is lighter?

Yes. By 18kg.

Hold on... 18 kilos? On a two-tonne car?

Yes, that's a less-than-one-per-cent reduction. The weight loss is achieved by the use of a world first: carbon-fibre windscreen wipers (which also have been designed without articulation, so they're more aerodynamic), some new lighter alloy wheels and a lightweight, redesigned screen over the rear engine bay. However, it's not so much the weight that makes the Chiron Sport quicker, but the chassis modifications.

Ah, now we're getting somewhere! What has happened to the Bugatti's underpinnings?

The programmes that govern the adaptive dampers and rear differential have been toughened up, while the Sport also features torque vectoring. These factors combined heighten the Chiron's agility and nimbleness, and also make it 'even more emotional to drive' than its 18kg-heftier stablemate, according to Bugatti's president Stephan Winkelmann.

Can I easily identify the Chiron Sport from its less-focused siblings?

Yes, aside from the wheels and the weird wipers, the centrally mounted quad exhausts at the back, a great big '16' logo on the front grille (a nod to Bugatti racers from the 1920s and 1930s) and anodised black switchgear, as well as Sport-specific stitching for the upholstery inside.

All right, let's have it - how much?

At the Geneva Motor Show, where Bugatti displayed the Chiron Sport for the first time, it was said to cost £2.36million, plus local taxes. That's £260,000 more than the original Chiron, of which only 500 were slated to be made. Serious stuff, then.