By the time British Superbike Championship leader Shane Byrne suffered his first DNF of the season, falling in race two at Knockhill on Sunday, nearest title challenger Cal Crutchlow had already suffered the same fate in race one and was fighting his way from the back of the grid in the restarted second race.

The HM Plant Honda rider, whose team-mate Leon Haslam took his first victory of the year in race two, claimed full responsibility for the first race fall, while labelling the tyre call that penalised him so heavily in the second outing 'a lottery'.

"I'm very disappointed overall," confessed Cal. "In the first race it was a stupid crash in pretty dodgy conditions really - half wet, half dry. I hold my hands up to it as it was my mistake as I hit a wet patch. It was my fault!

"The second race was a lottery really with the conditions and on tyre choice and we made the wrong one," he explained. "On the sighting lap I realised so we had about a minute to get onto the spare bike with slicks and unfortunately we were too late and had to start from the back of the grid on about the wettest part of the track.

"I carved my way through but was disappointed not to finish higher up, especially on a day when I so wanted to get a double win," he declared.

"Cal was so disappointed as he felt he was on podium pace, but he just couldn't get to grips with that last sector," added team manager Havier Beltran. "The tyre choice for the second part of race two was wrong, but we missed the window to get him out on slicks to take his place on the grid. Either way, we now have two riders who are confident of winning in the class, which is very positive for the team."

Crutchlow remains second in the 2008 BSB standings, but is now 100 points from Byrne and only eight points ahead of Rizla Suzuki's Tom Sykes, who won race one at Knockhill.