We love a half-price hero here at Autocar. We also love ultra-rare ‘Unicorns’ – indeed both our recent stories on these subjects are among the most popular on our website in recent weeks. But I have just bought a half-priced hero that is also a unicorn: a 2014 Ford Fiesta. How can the UK’s best-selling car be a unicorn? Let me explain.

I originally budgeted around £8,000 to buy a new car to get to work in every day. I wanted a petrol, partly because I love petrol verve and dislike diesel rattle, but also because I suspect diesels will start to be taxed punitively. Un any case, my wife forbade another black-pumper in our fleet. And choosing petrol is so much easier now that there's a new generation of small, efficient turbocharged petrols out there.