Now a couple of years old, the latest version of the famous Mercedes SLK luxury roadster focuses more on comfort than performance, making it a rival for the BMW Z4. However, you’re still likely to find that the 1.8-litre turbo petrol engine produces an exhilarating amount of acceleration and speed. Most road bumps and holes are ironed out by the suspension, but switch the SLK to Sport mode and it stiffens up to improve cornering performance. You can choose from a range of four and six-cylinder engines, with this third generation marking the first diesel engine to be available in the SLK. Meanwhile, the exterior has taken some design elements from the Mercedes SLS to offer a more stylish look. Inside, good quality abounds, with the optional Magic Sky Control roof being the highlight, with its special glass that allows the driver to adjust the level of transparency. So, in the summer you can make it darker (and therefore cooler) or let in more light when the sky is overcast to make the interior feel airier. That's as close as you’re going to get to controlling the British weather!