Charley Boorman has revealed that he and Ewan McGregor are keen to make a third big biking series together.
The pair motorbiked 20,000 miles from London to New York via Europe and Asia for their 2004 hit series and book Long Way Round, and from John O'Groats to South Africa for the follow-up Long Way Down.
Charley said: "We've always spoken about doing a third series - maybe to South America - it's just a matter of timing. These things take a lot of time and commitment, so we need to get the diaries right and then I'm sure we'll head out."
The pair met in 1997 on the set of the film The Serpent's Kiss, and they hit it off immediately.
"We became very good friends. We both had motorbikes and we'd both just had our first child, so we had a lot in common. We ran motorbike race teams together and eventually started talking about the big trip."
Ewan has now moved to Los Angeles but Charley still sees him when they're in the same town and they speak regularly on the phone.
This year Charley will be doing a motorcycle tour of Africa, another Extreme Frontiers series in a different country and is also hoping to open a motorcycle clothes shop in London.
:: Extreme Frontiers by Charley Boorman is published by Sphere, priced £20. Available now.