Virgin Racing was left to rue hydraulic issues throughout the second pre-season test at Jerez, which have delayed plans for the team's debut F1 campaign.

Issues throughout the four days of running meant the team was able to put just 144 laps on the VR-01 during the week, the lowest amount of any of the eleven teams present. By comparison, Jarno Trulli managed 141 laps on one day of running with the Lotus T127, which was making its first testing appearance.

The hydraulic problems will force Virgin to change its programme for the upcoming test at Catalunya to focus on reliability, which will mean new aerodynamic parts which should have been tested in Barcelona are now set to debut in Bahrain for the opening race of the year.

"It has been a character-building week, that's for sure!" technical director Nick Wirth said. "Despite our best efforts to cure the hydraulic problem which has beset our entire test, this was simply not achievable with the components that we had available in the field.

"The specific problem is that we have been losing hydraulic oil at a rate which has limited the number of laps we can achieve on each run and so we look forward to receiving updated parts for the Barcelona test, which we expect to fully resolve the problem.

"Having said that, we will now need to continue focusing on reliability work when we would have liked to introduce our Bahrain-specification aerodynamic updates. The revised programme means we will be reserving our full set of aero warpaint for the first race."

Despite the frustration of the four day test, Wirth added that he was pleased by the work that has been carried out and said the pace shown by the VR-01 to date has been encouraging.

"Despite these issues, we have actually completed a lot of good race preparation work and it is satisfying to see the car's potential with minimum set-up changes or development, bearing in mind that we have consistently run with a healthy amount of fuel," he said. "Indeed, none of our lap times have been achieved with anything close to qualifying fuel and therefore we are not letting the frustrations in one specific area overshadow what has generally been an encouraging start to our development programme."