your council tax bills ,bankstatement ,even tanent contrat,utility bils...etc

hi dear all i'm applying 10 years long residence SET(LR),but have a gap unfortunately.I dont know how to calculate the gap as my case is 10/10/2010 i apply an extension of my student visa 15/10/2010 my old student visa expired 22/10/2010 i received a letter from ho told me my application is rejected ...