When they update your points every month you can check what youve earnt before it displays it in pounds etc,
YOU CAN ONLY DO THIS WHEN ITS UPDATING AND SHOULD LOOK LIKE THIS
The points showing are those earned between 01 JUN 2011 and 31 JUL 2011. ETC!
Should happen round the 1st /2nd day of every calender month you can do this
YOU CAN ALSO DO THIS EVERY MONTH