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Help MSN Cars and Driver Power to find Britain's best - and worst - new cars

Getty We're on a quest to find Britain's best new cars to buy and own - and we need your help. MSN Cars has teamed up with the Driver Power survey, Britain's biggest report of its type. It speaks to real motorists to find out what they think of their cars.

Alfa Romeo 4C concept (2011) at 2011 Geneva motor show

Alfa Romeo has unveiled this gorgeous, mid-engined 4C concept car at the 2011 Geneva motor show, previewing a production vehicle due in 2012. Is this Alfa Romeo 4C concept the new Spyder? No, it's not a production version of Pininfarina's 2uettottanta.

Boris planning war on diesel car drivers – London Mayor wants drivers of diesel cars to pay more

Boris wants to charge diesel cars an extra £10 to enter London We’ve long banged on about the nonsense of basing the cost of motoring on the Co2 emissions of cars, and it seems the London Mayor, Boris Johnson, also realises that Co2-based taxation has led to a real pollution problem. As we reported as far back as 2010, petrol cars – certainly before the introduction of Euro 6 emissions recently – are far cleaner than diesel cars when it comes to the sort of stuff that really matters – NoX and particulates. And the problem has been exacerbated by basing car taxation on Co2 emissions as lower Co2 levels have been much easier for car makers to achieve on diesel engines, which is why diesel-engined cars now account for around 50 per cent of all cars sold in the UK.