Johann Zarco appears to be a man on a mission at Silverstone after setting the fastest time in First Practice for this weekend's 125cc British Grand Prix.

The Frenchman was controversially denied his maiden victory five days ago in Catalunya after a last corner clash with Nicolas Terol, but pipped the championship leader in the dying seconds here with a lap time of 2:16.579.

Unlike in Barcelona, Terol had to settle for second, 0.040s adrift after a session in which he didn't enjoy the same level of dominance that he had at previous circuits. The times didn't truly tumble for the Bankia Aspar rider until the final five minutes when he usurped previous leader Maverick Vinales.

The 16-year-old has been challenging for victory in each of the last two races and had no problems getting used to the Silverstone circuit, although his Blusens by Paris Hilton Racing teammate Sergio Gadea did snatch third from him at the very end of the session.

Alberto Moncayo was a surprise fifth for Andalucía Banca Civica ahead of Efren Vazquez who also had a spell at the top of the timesheets midway through the session. Sandro Cortese, currently second in the championship, had a quiet morning but moved up to seventh on his final lap, snatching the place from Danny Webb who ended up an excellent eighth on the Mahindra GP125.

Simone Grotzkyj and Luis Salom completed the top ten with Adrian Martin the second of the Aspar Aprilias in 11th. The team's third entry was even further down as Hector Faubel struggled to do any better than 15th.

Jonas Folger enters this weekend on the back of a podium finish in Barcelona but he could only manage 12th, one place ahead of his British teammate Danny Kent whose session was blighted by a crash at Vale, although he escaped any injury.

Taylor Mackenzie featured in the top ten early in the session before falling to an eventual 25th while Harry Stafford was 28th and John McPhee, running as a wildcard for the second weekend running, was 30th.