In 2003, Delaney toured the UK supporting Jerry Sadowitz, performing at venues including Manchester University and Shepherd's Bush Empire, London. His first Edinburgh Festival Fringe show, Purist, won generally very positive reviews, including four stars from comedy website Chortle, and The Independent newspaper. Delaney had two of his gags included in the top ten of the third annual Dave Award for the Funniest Joke of the Fringe, the only Comedian to do so. Following an increased profile due to appearances on Mock the Week and Dave's One Night Stand, Delaney toured Purist in 2013.