Motors in Letchworth

The most popular colour for the last Fiat 500 was red - so you may be wondering why it wasn't a shade offered on the new, all-electric model.

Here is the answer – the company was waiting to reveal a new model, created with the charitable organisation (RED). Rock star Bono, co-founder of (RED), even turned up at the unveiling of the car, spurred on by the promise of more than $4 million from Fiat over the next three years for the charity.

You might have never heard of Rimac. But the company is certainly well-known by other car makers, especially those who want a bit of help engineering electric cars. In just ten years, the Croatian founder Mate Rimac has companies such as VW and Hyundai fighting to sign him up as a development partner.

But for now, Rimac is concentrating on producing his own car. It is seemingly irrelevant and unachievable for anyone who isn't a billionaire – but it is a technology showcase full of innovations which will filter down to the cars we drive in the near future.