Category from tier 4 student to tier 1 psw Date of expiry of current visa Feb. 1st, 2011 Date application posted Jan. 31st, 2011 Date application received Feb. 1st, 2011 Date application removed from PO box by Durham Feb. 2nd, 2011 Date account debited Feb. 8th, 2011 Payment mode - Debit Card Acknow...