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.
Farmer qualified for the 2008 BDO World Darts Championship outright but lost in the first round to England team-mate Tony O'Shea.
[1] He continued his run by beating German qualifier Kevin Münch in the second round, but was then whitewashed 0–4 by world number three James Wade in the last 16.
[4] Farmer lost in the preliminary round of the UK Open 1–4 to Jamie Lewis,[5] and reached the last 16 once more in his final ten tournaments of 2012, at the penultimate Players Championship where he was beaten by Gary Anderson 6–1.
[7] He reached the last 16 of the final UK Open qualifier where he lost 6–4 to Matthew Edgar, but the £600 he earned was enough to see him enter the tournament in the preliminary round.