By John Stevens Postmasters are demanding the Government be punished at the ballot box after it was accused of secretly pushing to delay compensation. Ex-Post Office chairman Henry Staunton has claimed a senior official had told him to stall on payments to victims of the Horizon IT scandal until after the election. In a bombshell interview, the ousted boss urged ministers to finally give postmasters including Alan Bates the compensation they deserve. The Horizon IT system ruined the lives of hundreds of Post Office workers when it mistakenly made it look like money was missing from their branc…