Are you ready for the top five cheapest new diesel car countdown? Great, me too. Gracing position five - Top of the Pops style - is the much-loved Ford Fiesta 1.4 TDCi Studio. This robustly constructed supermini produces 70ps, reaches 62mph in 14.9 seconds, handles nicely, and averages a pleasing 68.9mpg. Not bad for a little car that only costs £11,945. In diesel motoring terms, it is cheaper than a knackered record player.Next to perform is the Skoda Fabia 1.6 TDI CR. This musical maestro costs even less than the Fiesta, so it finishes fourth with a price of £11,730. Again, this is a capable run- around. It is easy to drive, has robust Volkswagen underpinnings, and averages a highly respectable 67.3mpg. Emissions are 109g/km, so twelve months road tax costs £20. Same as the Fiesta then. It also has a comfy cabin and surprisingly attractive body work. Next to 'strut their funky stuff' are the Ford Ka 1.3 TDCi Zetec and the Peugeot 207 1.4 HDi Access. These cost £11,295, which places them joint third, and second, in the cheap new diesel showdown. The Peugeot 207 is better value as it is a supermini - whereas the Ford is a lesser city car class vehicle. So, the 207 has a larger boot and MP3 connectivity. Both have similar fuel efficiency, around 68mpg, and their emissions are extremely low. Despite strong showings from its competitors, top of the pops this week is the Smart Fortwo CDi Pulse. This pint-sized plaything could be sitting by your MP3 collection for only £10,400 – barely the price of a concert ticket. Whereas the Smart Fortwo is not the most versatile car in the world, it is very cheap for a diesel. Expect this 0.8-litre machine to average 85.6mpg, reach 62mph in 16.8 seconds, and make you the centre of attention.