I am ready to undertake this quiz but it's not yet available. Is this on purpose or can it be unlocked? 
Dear Michael,
Thank you for flagging this issue. I'm pleased to say that it's now been resolved, and you should be able to access both assessments. Please let me know if you still have any issues.
Good luck with the assessments, and best wishes.
Graeme
Dear Graeme,
Thanks for the quick response and regards.