 He was not offered a new contract at the end of the 2005–06 season, due to the manager wanting someone younger, and left the club, joining Boston United in June 2006, where he made 43 appearances during the 2006–07 season as Boston were ultimately relegated from the Football League in May 2007.After one season at Boston, Farrell joined Conference National side Burton Albion in July 2007.He was released by Burton after his one-year contract expired at the end of the 2007–08 season and re-joined Boston United, now in the Northern Premier League Premier Division, in June 2008.