Henderson then qualified for the 2010 BDO World Championship, winning one of four places available from the Inter-Playoff Qualifiers in Bridlington. He was defeated in the second round by Scott Waites. Henderson failed to qualify for the 2011 tournament, but did qualify for the 2010 Grand Slam of Darts where he finished third in his group. After being defeated by Mervyn King he was accused of standing in front of the oche, however after watching the match again, King admitted that he had over-reacted and apologised to Henderson in a pre-match interview.