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Find out more about BTR
Take part in one of our fiendishly tricky three-minute quizzes
Ford Transit Supervan 3
The only surviving Ford Supervan, the third and final take is also the most extreme
Audi Avantissimo
The Avantissimo could have been the world's first production luxury estate, but it wasn't to be…
Mercedes F400 Carving
The F400 Carving looked bonkers, but it was a deadly serious testbed for cutting-edge tech
Nissan R390
When Nissan decided to compete at Le Mans, it had to build just one road car to comply
Toyota FXS
Using Lexus SC430 running gear, the FXS could have been a great boulevard cruiser
Cadillac Cien
The Cien could have lifted Cadillac's image by several notches, but GM's bean counters said no
Jaguar R-D6
The R-D6 was radical for Jaguar, but when it was unveiled that's just what the company needed
Mazda Nagare
Maybe one day we'll get to drive cars that look this good
Fioravanti Vola
With its neat styling and radical roof design, this could have been a landmark sports car…