REFEREE James Bell had to be substituted with cramp during the National League play-off final.Shortly after half-time of extra-time in the contest between Southend and Oldham, the whistler had be replaced by fourth official Aaron Bannister.GettyReferee James Bell was forced off with cramp[/caption]Aaron Bannister stepped in for the stricken refTHIS IS A DEVELOPING STORY..The Sun is your go to destination for the best football, boxing and MMA news, real-life stories, jaw-dropping pictures and must-see video.Like us on Facebook at https://www.facebook.com/TheSunFootball and follow us from our main Twitter account at @TheSunFootball.