You would have had to have done the course elements for the ATPL(H) exams (POF/ parts of AGK that is H specific/ etc) and have a PPL(H) before taking the exams.
If you do not have the PPL(H) at this time then I think you just have to take the papers (and do the course) for the difference, not the whole lot (but uncertain..)
h-r
Good number of posts, which service do you require sir?