After beginning Grasstrack racing aged 6 and winning five British championships, Camier became British Junior 80 cc Road Racing champion in 1998. He won the British 125 cc title in 2001 and the British Supersport crown in 2005. This period built a working relationship with Honda which included contesting the 2005 Suzuka 8 Hours race in 2005 at the age of 18 (unusually young for a non-Japanese rider).

2007 was his first season in the British Superbike Championship on a Bike Animal Honda. He led the first corners of his very first race and was on the podium in the first three races. A crash in race 6 at Silverstone and two eighth places at Oulton Park damaged his momentum however. At Snetterton, a bike failure in qualifying saw him start 29th but he moved up to 6th in both races amidst Honda dominance. His season ended with a huge crash at Cadwell Park causing a broken left femur and right pelvis.

For 2008 he joined the GSE Racing Airwaves Ducati team alongside former champion Shane ‘Shaky’ Byrne. He finished fifth overall, taking his first three wins.

For 2009 GSE switched to Yamahas and James Ellison joined as him teammate. Camier quickly dominated the series, winning even more races than Byrne had in 2008. He clinched the title with four races to go fittingly by overtaking closest rival Ellison on the penultimate lap of race 1 at Silverstone. Immediately on returning to the pits he was greeted by Niall Mackenzie (the last man to win the BSB title on a Yamaha) decked out in his original 1998 Rob Mac Cadbury’s Boost leathers. Camier ultimately won a record-breaking 18 races despite only leading out of the first corner twice. His success led to the organisers of the series to adopt the “Showdown Rule” for 2010. This revised the points system to the split-season format popularly used by saloon-car series in the United States.

Camier raced full-time with Aprilia in World Superbike in 2010. He finished second to teammate Max Biaggi in race two at Miller Motorsport Park, giving Aprilia their first 1–2 in the series. At his home round at Silverstone, Camier started 16th but fought back to finish sixth and third in the two races.