Previously only available in the flagship Aero model, prices will start from just £25,315 for the Vector Sport variant.

The Saab TTiD engine produces 180 hp (132kW) and 400 Nm of maximum torque, specific power outputs that are unmatched among competitor products on the market. With a combined fuel consumption of 50.4mpg for the Saloon, and an exceptionally low CO₂ emissions rate of just 149g/km, this engine offers class-leading economy, together with in-gear performance on a par with the 2.8V6 turbo petrol engine.

David Pugh of Saab Great Britain, said: ‘The addition of the TTiD engine to our Vector Sport model means that we can offer top level diesel performance with superb fuel efficiency in a greater number of our cars - this really is putting technology in a price range that has never been seen before.'