Have you seen Trafford's published information on the system? Here's a link which has other links on it. http://www.trafford.gov.uk/cme/live/cme ... ory_id=705
I don't know the different timings for exams if you aren't *here* when the actual exams take place. I do know that there are other dates because 2 latecomers in my child's school arrived and took the exam at the end of the Christmas term, if I recall correctly. I think if you call Trafford using the info on the link above and discuss it with them they will be able to help you with part of the question.
I'll be back tomorrow to think about the other bits of the question - got to take children swimming!