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BMW M4 Convertible revealed. Price from £60,730

The BMW M4 Convertible (pictured) revealed We reported last month that the new BMW M4 Convertible would debut at this year’s New York Auto Show, and here it is ahead of that debut complete with trick folding metal roof, 425bhp and a price tag that just nicks over the £60k line. A direct replacement for the old M3 Convertible, the M4 Convertible will cost you just over £4k more than the M4 Coupe, but for the extra money you get the same car but with infinite headroom – and a big weight penalty. The new 3-piece metal folding roof can be tucked away in a mere 20 seconds at the flick of a switch, with better noise insulation than the M3 Convertible had and more room in the boot when the roof is down too.

Would you buy a Buick Park Avenue?

The last time we saw the Park Avenue stateside was in 2005, when the second-generation model departed Buick's U.S. lineup as a relic from the '90s. But just a couple years later the Park Avenue nameplate reappeared in the Chinese market to replace the Buick Royaum, an exceedingly long sedan based on an Australian-market Holden.

British EV prototype competes for $10m prize

A Silverstone-based company has emerged as the only British (and European) contender for the $10m Automotive X-Prize, a competition to find the most environmentally friendly car on the planet. Delta Motorsport’s E-4 Coupe concept has been accepted into the next stage of the X-Prize competition and the company now has to prepare a fully functioning prototype. Backed by an American insurance company, the X-Prize was set up to 'inspire a new generation of viable, super-efficient vehicles that help break our addiction to oil and stem the effects of climate change'.