Donnie Campbell from Lewis is on a mission to become one of Europe's fastest amateur drivers, so he's entered his Subaru Impreza into a major speed trial - Ten of the Best. He's souped up the engine to 1000 bhp - but is that enough to qualify? Fiona Mackenzie returns to Air an Rathad as this week's guest reviewer. She's always been a fan of the BMW brand, but will a spin around Perthshire in an Audi A3 Sportback change her allegiance? Ian Mackenzie from Stornoway is this week's Petrolhead, driving his Firenza Droopsnoot, and on the Wacky Race track the team are having a 'smashing' time!

Donnie has his foot on the floor on the Knockhill racing circuit, where he joins petrolheads on a 'hot hatch' day. Unlike public roads, you can drive as fast as you like on the track, with no speed restrictions! Donnie gets a masterclass on how to drive safely at speed, and enjoys every minute. Linda is test driving the new Mercedes A class in Montrose. It's packed full of new safety features and she decides to try the self park system. Can the car really park better without her hands on the steering wheel? Wacky Races gets messy this week - can Murray's lead be toppled? Donnie and Linda are determined to wrestle the Cup from his grasp. And Morven Graham tells us why her Honda Civic is the right car for her.