His first full season at London Road Stadium resulted in another promotion where the club won promotion to the Championship. On 13 April 2009, Lewis was made to face a penalty three times against Millwall in an unusual refereeing decision. After David Martin of Millwall was tripped and a penalty awarded against Peterborough, Lewis was twice judged by the assistant referee to have moved off his line before the ball had been struck by Gary Alexander – on both occasions Lewis saved the penalty. At the third attempt, Millwall replaced the unsuccessful Alexander with Martin, who scored and this time the penalty stood. Speaking on "Sky Sports News" after the event, ex-referee Dermot Gallagher commented that whilst the assistant was consistently working to the letter of the law, his decisions were harsh.