[8] He made his first-team debut on 26 September 2001, replacing the injured Pierre Issa after 27-minutes of Watford's 3–3 draw at home to Birmingham City.

[16] Doyley's first goal was scored on his 269th appearance for the club, on 7 December 2009 at Vicarage Road in a 3–1 win against Queens Park Rangers, over eight years after his first-team debut.

[17] On 14 February 2012, Doyley received the first red card of his career when he fouled Jermaine Beckford in injury time during Watford's 3–2 home win against Leicester City.

[18] Almost three years after his first goal for the club, Doyley scored his second on 15 September 2012, with a cross that evaded all the players including the goalkeeper, during Watford's 2–1 defeat away to Bolton Wanderers.

[22] After recovering from injury, Doyley had been training with Charlton Athletic,[23] Queens Park Rangers, Bristol City,[24] and Gillingham in the hope of securing a contract.

[33] Whilst out of contract, Doyley was allowed to use Watford's training facilities and was given game-time with the club's youth teams in order to maintain his match-fitness.

[5] In June 2021, Doyley was announced as the new assistant manager to Luke Garrard at National League side Boreham Wood.

[39][40] Following Garrard's departure at the end of the 2023–24 season, Doyley remained at the club as first-team coach, supporting new manager Ross Jenkins whom Doyled had played alongside at Watford.