A new range of city models is being planned by BMW, and they could be called Isetta after the famous bubble car of the Fifties.In Issue 989, we revealed how the firm was looking at the designs for such a vehicle (above). But now, it seems the project is being developed into a range of eco-friendly models to sit below MINI.Back in September, bosses announced plans for a fourth brand – and this is the clearest indication of what it will be. StrongAn insider revealed the range would be primarily designed for town use, but driver appeal would still be key. As with MINI, it would need a badge with a strong heritage. And while Isetta is the likeliest candidate, BMW has some classic British badges at its disposal – most notably Triumph.There has been speculation that BMW’s new range would be hybrids. However, our insider said: “That technology is reserved for larger models, such as our SUVs.”Instead, small turbo petrol and diesel engines would be used to help keep costs down, yet provide decent performance and excellent economy and emissions. This last feature is a key reason for BMW giving the city car project the go-ahead. It needs to reduce the average CO2 outputs from its vehicles to meet new EU targets