On the list in the link above.
ISBN 0708719864 and no. 0708703879 contain the same multiple choice papers.
No. 0708719899 and no. 0708703801 contain the same standard papers.* The only difference between these 4 papers is that they are either in the standard format or multiple choice
There is a new MC GL NVR paper due in Feb 2011 ISBN 9780708720486
Again what are the 11a,11b and 11c
These are what the papers inside the folder used to be called, they have been renamed in the new edition.
I hope that helps because the publishers really couldn't have made it more complicated!