All of the PDFs in the 'Answers & Solutions' HTML page (answers.html) are password-protected, so that students can only access them with your permission.
The password for each file is a four-digit code, as follows:
------------------------------------
File Code
------------------------------------
Commentary.pdf 1005
DiagramComplete.pdf 6113
QuestionsMarkScheme.pdf 2887
TaskMarkScheme.pdf 4392
The following password is the master password and can be used to open all of the password-protected PDFs:
zz2ghc4
Note that all of the above are also provided as non-protected, editable Word documents.