These devices might help to save the planet but are they actually any good? Suzi and Jason plan to find out by going head-to-head, putting the various products to the test.

With differences of opinion about ‘green-tech’, this will be an intriguing challenge, to say the least. The game pair also road-test unusual personal transport devices, including a jet-powered mountain bike, hydrogen fuel-cell bike, Sachs Madass 125 motorbike and electric motorcycle.

But which is king of the road? Jon Bentley, meanwhile, goes in search of the best pseudo-surround-sound speaker systems on the market with the help of Radio 1’s James King.