Farmer's first big run came in the 2006 Winmau World Masters, reaching the semi-finals with wins over Tony Eccles, Michael Rosenauer and John Walton before losing 6-0 in sets to Martin Adams. He then reached the final of the 2007 British Classic, losing to Co Stompé. He was then part of the England team in the 2007 WDF World Cup, reaching the Quarter-Finals of the Men's Singles event and helping England to victory in the Team Event.

Farmer qualified for the 2008 BDO World Darts Championship outright but lost in the first round to England team-mate Tony O'Shea. Farmer though was unable to maintain his form from the previous year and was forced to qualify for the 2009 BDO World Darts Championship and lost in the early qualifying rounds. He did though reached the quarter finals of the 2008 World Masters, qualifying for the last 16 where he beat Gary Robson before losing to Martin Adams.

In 2010, Farmer switched to the PDC. On 4 September he reached his first PDC ProTour event final in Crawley, losing to Adrian Lewis 4-6 in the final. Two weeks later, on 19 September, he won his first career title: the Dutch Players Championship by beating Kevin Painter 6-4 in the final. This win meant that Farmer qualified for his first PDC major, the 2010 World Grand Prix. He lost in the first round against Steve Brown by 2 sets to 1. In the 2011 PDC world championship, Farmer came up against a strong player in Paul Nicholson. He lost 0-3 in sets. He reached the semi finals of the 2011 Players Championship, but lost to an on form Gary Anderson, 7-10.

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Wikipedia