Its because people who were contracted to work until 10:30pm to clear the queues were actually having to work until 11:30pm in come cases. And not all the centres stay open until 10pm some close at 9 and others at 9:30 .
It means rather than leaving customers in the queues all night because people couldnt answer them, the staff have a chance to answer every call and clear the queues down.
Edited by deleted (Mon 03-Dec-07 22:55:20)