Toby joined London Irish in 2002 as assistant academy manager where he helped recruit the first players for the academy - many of whom are now playing for the Exiles' and Bath's first teams. Toby was appointed head coach at London Irish in 2008 after the previous coach, Brian Smith, became an England coach. Booth's team reached the final of the Guinness Premiership in his first season in charge. In May 2012 Booth left London Irish for Bath to work under new head coach Gary Gold, two months after Smith's return to the Exiles as director of rugby.