Last week, to coincide with the launch of the new Jaguar XF Sportbrake, Jaguar revealed what it calls the car’s ultimate accessory, Concept Speedboat by Jaguar Cars.

Now your first instinct may be that this boat, which has so far never sat in the water and which doesn’t even have a working powertrain in it, is a piece of marketing frippery created to grab a few easy headlines. But it’s actually worth delving deeper than that.

The boat’s design is the work of Jaguar design director Ian Callum and his team, and has been treated very much as an opportunity to showcase their talents. While it may not have been toiled over in quite the same way as the new Jaguar F-Type – it was finished just two days before being revealed – Callum’s passion for project is every bit as evident as it is for his four-wheeled creations.

“It’s a statement of what we can do as a design team,” says Callum. “A car is just about the most complicated piece of design in everyday life – there are so many forces at work, be they engineering needs, legislation, cost and production variables or whatever. We have to design with all these factors in mind.

“But with the boat we were freed from that, and I wanted us to show the wider design world what we could do if we applied Jaguar design themes of form, fluidity and clean lines elsewhere. The lines express sleek and fast characteristics, just like our cars. The rear wing mimics the D-Type but is made of carbonfibre to keep high-up weight as low as possible; a modern interpretation of a classic look, if you like. I don’t mind saying that my design team is better now than it has ever been – we’ve grown together, and we want to showcase our talents.”