Submitting... Here’s our look at One Call boss John Radford and the hacking group DarkSide. JOHN RADFORD Businessman John Radford is the owner of One Call Insurance – he is also the owner of Mansfield Town Football Club. One Call has gone from being a small local firm run from an office into Doncaster town centre to a big national firm with a large office base at Black Bank. The firm offers various forms of insurance – and is understood to have thousands of customers. The company was previously involved in sponsoring Doncaster Rovers but now the firm has thrown its weight behind Mansfield, with the club’s Field Mill stadium being renamed the One Call Stadium.