A winner of the World Youth Masters in 1991, Barnard joined the PDC circuit in late 2003 taking part in UK Open regionals, reaching the semi finals of the Scottish Regional and the quarter finals of the North West Regional. His performances helped him progress to the third round of the 2004 UK Open automatically where he narrowly lost 8-7 to Andy Jenkins. He then reached a semi final in the Midlands Regional for the 2005 UK Open as he entered the third round automatically once more, losing to Roland Scholten. He followed this with a quarter final showing in the Open Holland.

Barnard started his 2006 UK Open campaign in the second round, beating Nigel Langton 8-1. He then beat Lee Palfreyman in the third round to reach the fourth round for the very first time. He was drawn against Ronnie Baxter and lost 11-7. Poor form forced Barnard to begin his 2007 UK Open campaign in the first round where he beat Vernon Shepherd but lost in the second round to Paul Williams. He then lost in the Preliminary Round in the 2008 UK Open, losing to Paul Cooper.

Besides from the UK Open, Barnard had failed to qualify for any of the other PDC majors. This run ended when he won one of eight places to qualify for the 2009 PDC World Darts Championship. He was beaten by Andy Hamilton in round one. Having finished the 2011 season ranked too low to retain his PDC tour card automatically, Barnard entered the PDC Q School in January 2012. On the second day Barnard earned his tour card for 2012 and 2013 by beating John Bowles 6-2 in the final stage.

In May 2012, Barnard earned a place in the German Darts Championship in Berlin by defeating Adrian Gray and James Richardson in the UK qualifier. He received a bye through the first round when Gary Anderson withdrew and then lost to Co Stompé in round two 6–5. He reached the last 32 of three other ProTour events during 2012, but could never advance beyond this stage. Barnard went into 2013 ranked world number 77.

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