With a weekend’s hindsight, it’s hard not to see the Moving Motorshow as an entirely inevitable addition to the Festival of Speed.

There’s always been a strong element of theatricality to proceedings at the festival, with wild and wacky concepts and one-offs mixing it up with brutally effective performance machinery.

Full report from the Goodwood Festival of Speed, plus pics

Citroen has said it plans to produce a very limited run of the stunning, videogame inspired GT, but for now it’s a motorshow “styling exercise” powered by an unspecified-brand V8.

To judge from the attention it gained, including outshining that paid to the bright silver Bugatti Veyron Pur Sang that was ahead of us on the way down to the start, its presence at Goodwood was a great bit of brand building.

The thousands who thronged around it in the supercar paddock, and then on its crawling way to the hill climb, didn’t care in the slightest that it was a unique one-off model designed for the show stand rather than the race track.

This is something I discovered, having been invited to drive the thing on Sunday afternoon, after about 10 seconds.

Citroen’s nervous engineer, sitting next to me in the GT’s uncooled, greenhouse-like cockpit, had already warned me that it wasn’t designed to be driven hard, with a 3500rpm rev limit because of marginal engine cooling and very heavy unassisted steering and brakes.

I understood what he meant at the first corner, where the Citroen’s brakes proved so alarmingly unresponsive I spent a couple of seconds contemplating the consequences of making a unique, million-pound Citroen part of Alfa’s ornate central display in front of Goodwood house.

Fortunately we shed enough speed to lurch round and I continued up the hill at a more sedate pace, returning the waves from the crowd and trying to keep ahead of the Tesla Roadster I knew was next in line.

But full credit to Citroen for even allowing us to drive a show concept on what is basically a race track. Another pure Goodwood experience.