Fiona gets lost on Harris and Murray is all at sea when the presenters two go head-to-head in an intriguing challenge. Murray has come up with a test to find out if a more ancient form of transport could be a faster way to get around the Western Isles than a super-fast boy racer's car. Louise tops up her racing skills with one of Knockhill's top instructors and gets the chance to live her dream behind the wheel of a Formula One car. How does she perform in the wet? Calum Iain has never been happier as he puts the brand new top-of-the-range Jaguar XJ Supercharged V8 Supersport through its paces. He also discovers levels of comfort previously unknown to him in a Mark 2 Escort. And we welcome Wacky Races - a brand-new feature in which our presenters battle it out on the race track, competing against each other in a driving challenge with a twist.

Fiona checks in at Stornoway airport where her estimated flying time is just 12.5 seconds. Calum Iain takes on the Catterline Cartie Challenge and Murray discovers the innovative technology of the new Mercedes E-Class Estate.