|British Grand Prix on the BBC|
|Venue: Silverstone Dates: 3 July to 5 July|
|Coverage: Live on BBC TV, Red Button, Radio 5 live, 5 live sports extra, online, mobile, the BBC Sport app and Connected TV. Full details here|
Lewis Hamilton was only fourth fastest in second practice at the British Grand Prix as Mercedes team-mate Nico Rosberg set the pace.
Hamilton, 0.466 seconds slower than Rosberg, complained about the car as both Ferraris also out-paced him.
Hamilton even aborted his race-simulation run because of the car's handling.
"The car is all over the place. I can't go any faster than I am now," Hamilton said over the radio.
The 2014 champion - who leads the drivers' championship standings by 10 points from Rosberg - struggled to lap within a second of Rosberg with a full tank of fuel on his race simulation.
Ferrari's Kimi Raikkonen pipped team-mate Sebastian Vettel by 0.02secs to go second as speculation swirls about the 2007 world champion's future at the team.
Rosberg also headed the first session in the morning, although Hamilton was faster on the first runs in the second session on the hard tyre, before his afternoon unravelled.
Despite Hamilton's problems, Mercedes look in a league of their own, ahead of Sunday's race at 13:00 BST - when 140,000 are expected to attend - with a comfortable margin over Ferrari on both low and high fuel in the region of 0.5secs a lap.
But Daniil Kvyat hinted at a better weekend for Red Bull with fifth place, suggesting that the aerodynamic qualities of the car might put them into a fight with Williams as third-best team.
The Russian's team-mate Daniel Ricciardo was sixth fastest, 0.144secs behind, ahead of the Toro Rosso of Max Verstappen, Force India's Nico Hulkenberg, the second Toro Rosso of Carlos Sainz and Williams's Felipe Massa.
Three drivers had incidents at the long, looping Luffield hairpin.
Romain Grosjean beached his Lotus in the gravel, bringing out the red flag for the car to be cleared. A few minutes later, McLaren's Fernando Alonso went off in the same place but managed to drive through the gravel trap and rejoin.
Later, Manor's Roberto Merhi spun and stopped, causing a second brief stoppage.
McLaren were struggling all round. Both drivers were limited on mileage because of the age of their engines, while Alonso's car looked uncomfortable to drive and Button complained that his was.
At one stage, his engineer asked the 2009 world champion if he wanted to do another lap, and Button replied: "No. There is something wrong with the car."
|BBC Sport chief F1 writer Andrew Benson:|
|"Silverstone is one of the few truly iconic venues still surviving on a Formula 1 calendar increasingly dominated by antiseptic modern autodromes.|
|"Although comprehensively revised and updated for the 21st century, Silverstone is still recognisably the same place that hosted the very first F1 world championship race in 1950.|
|"And in the Becketts complex of sweepers and the ultra-fast Copse, it has some of the greatest corners on any race track anywhere in the world. To stand and watch there is to be awed by the capabilities of the cars and the skills and bravery of their drivers.|
|"The British crowd is as enthusiastic and knowledgeable as you will find and the ingredients add up to one of the best weekends of the season, no matter what the weather."|