Richard restores a unique 1967 Delahaye sports car belonging to legendary Grand Prix driver Louis Chiron. But with the Delahaya's original paint to track down, Richard soon fears his dream to display the car to the classic car elite may be in jeopardy.

Richard prepares the MGB for the racing season, and fixes up an E-type for a classic car rally. Kamla is delighted when Richard ups the workshop rate. But the plan is derailed when Neil takes on a rusting Lancia to raise money for endangered leopards.

Richard and the Cogs restore a 1947 Delahaye and a Jaguar XK120 for Salon Privé. While Richard explores the future of motoring in a Bentley powered by synthetic fuels at Goodwood, a Lancia taken on to help endangered leopards threatens to derail plans.

Anthony gets the chance to do driver training in a race-spec Nissan Skyline GTR at Donington Park, but his attempts to repeat the experience in The Smallest Cog’s MGB end in spectacular failure.

After a disastrous test with the MGB, Richard warns the Cogs if they can’t turn things around in time for the next race, he’ll pull the plug on the whole project. And Neil struggles to get the Lancia finished in time for a Goodwood auction.

The cogs go International restoring an iconic 1970s Royal Enfield Interceptor motorbike. An epic road trip ensues when Richard, Neil and Andrew decide to deliver the bike themselves to the cool Wheels and Waves festival in Biarritz.

Richard redesigns his horsebox into an RV for the Cog race team but questions whether they should continue racing as the Cogs face their final event.

Richard and the Cogs restore 'Olivia' for a live audience at CarFest. But can the show help the team get their mojo back?