Watch as Porsche concept takes shape

It's not often we get the chance to see what goes on inside the design department of a major carmaker but today Porsche head of design Mitja Borkert takes us through the development of the Panamera Sport Turismo concept, built for the Paris auto show.

Borkert said: "The Panamera has one body style today: a four-door coupé. But we were intrigued by the idea of developing another version for Porsche, a sports station wagon."

Mitja Borkert introduces the Panamera Sport Turismo concept at the Paris auto show.

Which was by no means as simple as it sounds.

It had to both sporty and practical and, above all else, Porsche-like. To complicate matters further, the Panamera Sport Turismo is a runner, as are all Porsche concepts, with a plug-in hybrid set-up combining a 245kW supercharged three-litre V6, a 70kW electric motor and a 9.4kWh lithium-ion battery, for a total of 306kW, taking it from 0-100 in less than six seconds while averaging 3.5 litres per 100km and emitting less than 82 grams/km of CO2.