'Forza Horizon 4' has added free 'Top Gear' downloadable content.

Forza Horizon 4

Forza Horizon 4

Microsoft has confirmed the crossover collaboration with the hugely popular BBC motoring show, and host Chris Harris is on board to narrate the content included with the update.

As well as seven new story chapters and cosmetic options, the vehicles featured in the collection are the 1999 Lotus Elise, Austin taxi, the show's own modified, a 65 Mini Cooper, a Porsche 911 GT2 RS, G65 6x6 AMG, the 500bhp Track-tor and the show's own modified Mercedes-Benz E-AT.

The latter two cars can be unlocked by completing the 'Top Gear' missions, which will also give players an 'I am The Stig' shirt and white overalls for their driver.

Meanwhile, back in April Forza launched a free-to-play PC and mobile game called 'Forza: Street'.

The series of semi-sim racing video games developed by Turn 10 Studios is known for creating full racing simulation titles for Xbox consoles and Microsoft Windows, but the franchise turned its attention to a spin-off series which launched on PC and will follow on Android and iOS later in the year.