Until recently, the Skoda Fabia Estate would have been a good option. It was one of the only small estate cars on the market and was very versatile for its size. The new model isn't available as an estate (there aren't plans to introduce one, either) – but there are still some pre-registered examples of the old car in showrooms. You might be able to bag a good deal if you're quick. Alternatively, we'd recommend a Honda Jazz. It's a very practical little car, slightly shorter in length than your 207 SW. It's likely to be very reliable while its hybrid engine setup means it ought to be cheap to run.