In this episode, firefighter Matt and his wife Nicola find a new dimension to their relationship, whilst studio-recording duo Sas and Grant ponder what life will be like back in the office on Monday as they stretch their work relationship to the limit behind the wheel of a car. Train driver and train manager Wayne and Illy are neighbours as well as best friends, and they also spend every day together at work. But will their friendship go off the rails once they get on the Getaway Car circuit? Also wondering if they have done the right thing in putting their relationships in the spotlight - or rather headlamps - are long-standing couple Vicki and Lindsey and the glamorous and newly engaged Manuella and Jamie. We all know what it's like inside the car with a loved one when things don't quite go to plan. So, five couples who all love each other stuck behind the wheel of a series of cars and being put through challenge after challenge that will turn their stress levels up to the max. What could possibly go wrong?