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All 789bhp of the McLaren Senna prototype is unleashed at Silverstone, Bentley's new Continental GT wafts onto the streets, and BMW's silent i8 Roadster is driven for the first time. Mercedes-Benz's huge G63 AMG also rocks up. Finally, Brabham finally unveils the £1.2m BT62. Mira Orange Senna flies around Silverstone. Image credit: Autocar McLaren Senna prototype Anyone remember the P1? Of course you do. 903bhp pedalled 1375kg of hybrid V8 madness around, and 640kg of air was happy to help out with sticking the whole thing to the track. Well this time, you've got no batteries, no electric motors, and no 'form over function' thinking here. McLaren accepts that this isn't the nicest thing to look at, but anyway, the 720S is one of the best looking cars of the decade, and that's £550k less, and not sold out. Anyway, here you have 789bhp, 590lb-ft of torque and 800kg of downforce. Dry weight? A bag-of-crisps-like 1198kg. That's courtesy of a f...

Brabham Automotive has risen from the deep, Porsche records a scorching laptime at the Nürburgring, and two new hatchbacks are driven: the Suzuki Swift Sport and the Mercedes-Benz A-Class. That rear wing contributes to a huge 1200kg of downforce Brabham BT62 Brabham is one of those names that make a Formula 1 fan spontaneously combust with excitement. Their mix of innovation, cheeky rule-bending and records to their name sets the knees of any petrolhead trembling. Founded by Sir Jack Brabham, he managed to make himself the first driver to win a championship in a car bearing his own name. Their most famous car was the BT04, using a fan to physically suck the car towards the track. They're back. They're back with this, the BT62, and the headline figures, much like the Dallara Stradale  are of high downforce and a tiny dry weight. 972kg is all that keeps the car on the ground at standstill, but at 155mph, an extra 1200kg is happy to help. 1200kg. That is the highest downf...