As a rule people prepare accounts for 12 months.
So your first set of accounts would have been Y/E 30 June 2011.
Your first tax return was for 2010 so 6 months July 10 - December 10 or 1/2 the profit for the year ended 30.06.11.
Your second tax return was for 2011 so 12 months ended 30.06.11.
Your 2012 return based in 12 months ended 30.06.12 and '13 based on 12 months to June 13.
Your 14 return is based in the profit from 1 Jan 14 to date of cessation so effectively 6.33 months over the 12.33 months to 11 July 2014. In the year if cessation you have to look at the actual profit in the Calendar year 2013.