Two problems identified:
1) PDF document was not being moved to correct target directory (because this did not exist when the move command was executed)
2) A Sphinx RST :math: function was causing the PDF generate to abort (with a math error).
No commit with this JIRA ID on OS Master so can't backport?
this is marked for 3.3, is it needed?
Untargetting from 3.3 as the underlying code has changed