Clarkson, May and Hammond committed 'international crime' without anyone noticing during The Grand Tour finale

Jeremy Clarkson has opened up about how he, James May and Richard Hammond, committed 'international crime' without anyone noticing.

The famous trio - who have been looking back on their 22-year career together - have certainly ended it on a high with their new special The Grand Tour: One for the Road.

Their last ever episode of The Grand Tour sees them ignore producer Andy Wilman's instructions and head to Zimbabwe in three cars they’ve always wanted to own, a Lancia Montecarlo, a Ford Capri 3-litre, and a Triumph Stag.

Here's what to expect below:

Clarkson, May and Hammond have gone through a lot together, from being put in potentially life-threatening situations on TV, to watching Top Gear become the most-watched show in the world in 2013.

And fans have lived every moment with them as the three car presenters have now closed a chapter which began in 2002, before some of our audience were born.

While reminiscing on their long career, Clarkson revealed that when filming the last ever episode in Zimbabwe, he and his motoring mates appeared to commit 'international crime' without anyone clocking on.

Jeremy Clarkson, James May and Richard Hammond reminiscing about their 22-year-old career together (Amazon MGM Studios)

At an Amazon Prime Video Q&A event in London on Tuesday (10 September), the Clarkson's Farm star said: "I have to be a little bit careful because I believe the ambassador for Zimbabwe is here.

"One of the bits of the story that’s disappeared, which will make this not make sense, is that we discovered that in Zimbabwe you can buy silver for pennies, really surprisingly cheap.

"So we decided to buy a lot of it and use it to fashion accessories for our cars. Then when we got to the border with Botswana, we thought, ‘Oh, s**t, we’ve got all this silver’."

Hammond added: "We weren’t supposed to have it," while Clarkson explained: "So we had to get across into Botswana without anybody noticing that we’ve got quite a lot of silver about our person.

Calling them 'the world’s dumbest criminals', presenter Mariella Frostrup said: "You smuggled silver, huge amounts of it into Botswana."

As Clarkson went on: "Just in case when you see that you think, ‘Why are they that nervous about crossing into [Botswana]?’ That’s the bit that you didn’t see in the show."

The end of an era (Erin Mullis/Amazon MGM Studios)

Getting slightly emotional about their last day 'doing press interviews', he added: "I found it quite refreshing to be nice to each other cause normally we say that we’re fuelled creatively by a loathing of one another but it’s not really true."

May then joked: "I’m glad we didn’t think of it earlier, that would have spoiled everything."

Meanwhile, Hammond said: "I’ll miss the start of the special. And I miss the fact that we’ve done stuff together all over the world.

"Every conceivable landscape, but also the live stuff we’ve done together, and you reach a point where if we’re all three on camera, something happens, you do sort of instinctively know, 'that’s a Jeremy thing, I’m going to let him run with that'."

The Grand Tour: One for the Road is available to stream on Amazon Prime Video from 13 September.