Up front is typically beautiful 3 Series fare with soft-touch 3D layered dashboard, suspended iDrive infotainment screen and figure-hugging leather seats. However, step into the back and even the most faithful of 3 custodians will be in unfamiliar territory. That elongated roofline may be ungainly from the outside, but the combination of a taller glasshouse and extended wheelbase (there is 8cm more legroom in here than a 3 Series Touring) has transformed the rear cabin into a cosseting, luxurious 5 Series-rivaling environment where passengers in the back are no longer forced to identify each other’s brand of deodorant.