Doyle was born in Dublin, Ireland,[6] the son of Terry Doyle,[7] later President (2006–7) of the Association of Referees Leinster Branch of the IRFU.[8]
Doyle started his refereeing career with the Association of Referees Leinster Branch of the IRFU[7] in 2001 and joined the London Society of RFU Referees in January 2003. He was promoted to the South East Group later in 2003 and to the National Panel in 2006.[11] He refereed the final of the Daily Mail Under 18 Schools Cup at Twickenham Stadium in 2007[12] and the EDF Energy National Trophy Final in 2008.[13]
He was appointed as a trainee full-time official on 1 September 2008.[11] In May 2010, the Elite Referee Unit (ERU) of the RFU confirmed his full-time contract after successfully completing a two-year trainee programme that had seen him referee in the Premiership, the IRB Sevens circuit, the Churchill Cup and Pacific Rim Rugby Championship tournaments.[14]