Watch now: Koenigsegg, Bugatti-Rimac and Singer bosses drive each others' cars

Welcome to The World’s Greatest Track Day. The premise is simple: we invited the world’s fastest bosses to the Top Gear Test Track, but stipulated each had to bring along a car that everyone else could play with.

Enter Christian von Koenigsegg (with a CC850), Mate Rimac (with a Bugatti Mistral and Rimac Nevera R), and Rob Dickinson (with a Porsche 911 Reimagined by Singer).

Gentleman, start... each others' engines!

And stay tuned for Part Two, where we’ll sit Christian, Mate and Rob down for a big fat chat, letting them address the big issues in the auto industry.

(Oh, and we know Singer doesn't exactly make hypercars, but their offerings are just as exotic and priced accordingly. And yes, we extended the invite to Horacio Pagani and Gordon Murray, who were both keen to attend but couldn't make it work... this time.)