#408 Bitcoin & Hydrogen. Why did Tesla spend billions on virtual money? How hydrogen really could be the energy medium of choice for road and race cars in the near future. Plus: the truth about Lewis’ new contract and the secret of Ferrari’s new engine.

#407 Extreme E, WEC And F1. We get excited about the new electric SUV race series, but is it just greenwash? Hypercars will race in the World Endurance Championship, but how many? Plus the latest F1 news and new On Speed music as Blurb perform Boys Toys.

#406 Hyundai and Apple, The Dakar and RC Cars. The iCar is back. We drool over the Prodrive BRX Hunter and the challenge of the Dakar Rally. Radio Controlled cars and racing them over the internet. Plus new music: Spook Foggy Fog performs I Don’t Drive.

#405 Suzuki Ignis 4WD Hybrid. Gareth takes what is arguably the cutest little car on sale in the UK today on a road trip to Wales and Yorkshire. An attractive, endearing looking thing, but does it have the functionality to match its rugged looks?

#404 Xmas Special. We review the season gone by, give gifts, virtually, read terrible Christmas cracker jokes, write poems and perform the Welsh tradition of Plygain, and share our hopes for the New Year. Plus new On Speed music with "Before Christmas".

#403 Crash & Burn? We discuss the dreadful crash and fire that Romain Grosjean narrowly survived at the Bahrain Grand Prix. We speculate on who will replace absent Lewis Hamilton at the next race, and consider the latest events in the new space race.

Video#59 Gareth trails forward to an upcoming episode of Gareth Jones On Speed, a review of the impossibly cute Suzuki Ignis 4WD Hybrid.

#402 F1 & SUVs. Is Lewis Hamilton of the verge of being the G.O.A.T, or is he that already? Alex drives some massive premium SUVs. Mustang and Hummer reinvented as EVs, a good idea? Plus new music as Raceless perform “Don't Mess With The FIA”.

#401 Audi TT RS. Gareth spends a week thrashing around north Wales in an Audi TT RS Coupé 400PS Audi Sport Edition S tronic, a short car with a long name. Just how much fun do you think a ground-hugging 400 BHP quattro drive sports car could be?

#400 On Speed Episode 400 LIVE Pt2. We look back at some of Gareth Jones On Speed’s greatest hits, and include clips of a selection of your and our favourite moments from our first 399 episodes.