Having dominated the dry morning session, Casey Stoner increased his advantage during a wet second Friday practice for the British MotoGP at Silverstone.

Only one rider, Marco Simoncelli, had got within one-second of Stoner in the dry - and the Repsol Honda rider pushed his advantage over nearest rival Simoncelli up from 0.659sec in FP1 to 0.797sec by the end of FP2.

Stoner - winner of three of the five races this year - was once again making massive gains through the final sector of the track, from the Hangar straight to the new finish line after Club Corner.

Stoner's gain was illustrated perfectly by his best lap, which saw the Australian 0.120sec slower than Simoncelli heading into the final sector - then gain almost a second on the San Carlo Honda Gresini rider by the line!

At 5.902km in length, moisture levels varied substantially around the circuit and, even when the rain stopped and sun returned, cool conditions meant wet tyres were used throughout.

With rain showers expected for the rest of the weekend riders couldn't afford to sit in the pits and all - except the injured Colin Edwards - completed at least 14 laps.

Nicky Hayden gained one place over his morning form to finish third on the FP2 timesheets for Ducati, but was 1.404sec slower than former team-mate Stoner.

MotoGP rookie and home hero Cal Crutchlow also made use of the conditions as he moved from sixth to fourth place (+2.443sec) for Monster Yamaha Tech 3.

World champion and 2011 points leader Jorge Lorenzo dropped from third in the dry to fifth in the wet, over three seconds from Stoner for the Factory Yamaha team.

Stoner's team-mate Andrea Dovizioso was sixth, with Lorenzo's team-mate Ben Spies matching his morning ranking of seventh. Then came Cardion AB rookie Karel Abraham, in a better than usual eighth, followed by seven time MotoGP champion Valentino Rossi.

The Italian, the only rider not to have previously raced at Silverstone, was 3.327sec slower than Stoner in the dry and 3.769sec behind in the wet.

LCR Honda's Toni Elias completed the top ten, while Edwards - who broke his collarbone last Friday at Catalunya - once again propped up the 16-rider timesheets, having completed 12 laps.

Although Edwards has returned to action this weekend, Dani Pedrosa is still sidelined by his broken collarbone, sustained in a clash with Simoncelli at Le Mans last month.

Rumours abound as to why Pedrosa's recovery has taken so long, with speculation of a training accident setting back his progress.

Silverstone returned to the MotoGP calendar last year and the 2011 event marks the debut of the circuit's new ?27-million Pits & Paddock.

Friday practice (2) - Silverstone:

1. Stoner
2. Simoncelli
3. Hayden
4. Crutchlow
5. Lorenzo
6. Dovizioso
7. Spies
8. Abraham
9. Rossi
10. Elias
11. Bautista
12. Capirossi
13. Barbera
14. de Puniet
15. Aoyama
16. Edwards