What would you expect to see in a premium car interior? Forget rear seat heaters, think wellness retreats. The Mercedes-Benz C-Class spec list takes driver comfort to a new level by offering something called 'Energising Comfort Control'. Debuted on the S-Class, it links the air-con, fragrancing, seat heating/cooling/massage function, audio and ambient lighting to improve driver comfort and even lift their mood. All in all, the fourth-generation C-Class has some 6,500 components new to the range. Continuing QUBE/just-auto's review of interior design and technology trends, we slipped inside the luxurious interior to see what stands out.