The Formula 1 young driver test at Silverstone has got underway with Williams, HRT and Marussia all testing on Thursday and Friday.
The test had been in doubt after Silverstone circuit bosses said they were unable to make the track available due to constraints laid down by Formula One Management.
However, Williams is running Valtteri Bottas, HRT is testing Ma Qing Hua and Marussia has brought Max Chilton and Rio Haryanto, who both drive for its GP2 team.
Bottas will run for both days while Ma will drive on Thursday and Friday and Chilton and Haryanto will share duties over both days, with Chilton starting on Thursday morning.
The test will take place at the Grand Prix circuit today and at the International layout tomorrow.
Bottas has taken part in six Friday practice sessions for Williams this year, including the British Grand Prix while Chilton has previously tested a Force India in the 2010 Abu Dhabi young driver test. Haryanto tested for Virgin in 2010 while Ma will get his first taste of F1 machinery at the test.