The Paul Bird Motorsport-run Kawasaki Superbike Racing team endured a difficult home round of the WSBK season, with Tom Sykes forced out of race day by a practice accident and team-mate Joan Lascorz only able to pick up a solitary seventh place.

Sykes joined Chris Vermeulen on the sidelines when he injured his ankle in the practice fall and decided not to risk aggravating the damage on race day given the fact he would only have started the races from 16th on the grid.

As well as missing Silverstone, Sykes is unlikely to fit to take up his planned guest ride in the BSB at Brands Hatch with a replacement rider set to be announced by the team.

"I woke up feeling like I had been run over by a bus and because we do not want to cause any further potential damage to my ankle we decided not to race," he said. "I also have a lot of pain and stiffness in my neck, back and shoulders.

"After qualifying on the fourth row because I could not make it into Superpole, I was not going to get anything too much out of this weekend, and the risk was a little too much. I do not want to speculate on my ankle injury until I see a specialist this week."

Team-mate Lascorz battled from 19th on the grid to finish seventh in race one of the weekend but a collision on the opening lap of race two saw his Ninja ZX-10R lose coolant and he was then forced out when the engine overheated.

"We had one good result and one unlucky one but my bike felt even better in the second race than the first one," he said. "It was unfortunate that James Toseland collided with me because his foot peg went into a water hose on my bike and it ran the cooling system dry which meant I could not finish. I think I could have had a top six if that had not happened. I was seventh in race one and that is not so bad having qualified 19th. We have to improve in qualifying but it is good to know that I can make a good race pace on the bike when things work out."