Mar.6 (GMM) The 2012 grid is complete, after backmarkers Marussia and HRT finally revealed their new cars on Monday.

Former Virgin team Marussia rolled out its MR01 at Silverstone, while HRT's F1112 was also running on demo Pirelli tyres for a 'filming day', at Barcelona's Circuit de Catalunya.

At 5pm, the struggling Spanish team's car managed ten laps with Narain Karthikeyan at the wheel.

"The first impressions are quite good," said the Indian driver. "It's definitely a step up from last year."

Monday was HRT's first ever winter test run with a new car, since the team's inception in 2010.

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