From the listing for these Virgin/Marussia F1 cars for sale:

From John Pye Auctions:

The Virgin VR01 is a Formula One racing car designed by Nick Wirth for Virgin Racing in the 2010 season. It was driven by former Toyota driver Timo Glock and Brazilian ex-GP2 driver Lucas Di Grassi. The car was the first Formula One racing car designed entirely with computational fluid dynamics. At the end of the 2010 season, Marussia Motors bought a stake in the team and became the main sponsor, with the team known as Marussia Virgin Racing for 2011.

Designed by Nick Wirth for the 2011 season. The addition of the “M” in the car’s chassis designation reflected the team’s new owner, Russian sports car manufacturer Marussia Motors. The MVR-02 followed the VR-01’s design principle of exclusively using computational fluid dynamics instead of the traditional wind tunnel approach. The car did not use KERS. Designed to be the same length as the original VR-01 chassis whilst retaining the full-size fuel tank.

The Marussia MR01 is the first Formula One racing car designed by Marussia F1 for the 2012 Formula One season. The MR01 is the only car to compete initially in the 2012 season without a Kinetic Energy Recovery System (KERS), regenerative braking device. The MR01 was one of only three cars (the others being the McLaren MP4-27 and the HRT F112) not to feature the stepped nose common to most 2012 season designs.

The Marussia MR02 is a Formula One racing car designed under the leadership of Marussia’s Technical Director Pat Symonds. The MR02 was the first car built by Marussia to utilise the Kinetic energy recovery system (KERS) device since the system was reintroduced in 2011. The car used a KERS device designed by Williams F1, based on the design that Williams used when they were a customer of Marussia’s engine supplier, Cosworth, in 2011.