It is a hard one Sophie. I think it stems from the base reason a lot of us are here in NZ. It has a skills shortage!
However even with the working time directive in the UK I think you would find that it did not matter if you were in middle management....you still worked horrendous hours!!! I would suggest that he takes his TOIL ASAP unless officially recorded in leave system, in case manager forgets. He should also find out from colleagues if this is typical.
Some NZ companies have a long hours culture. We are currently striving within our dept to get the work life balance back, but I work for a US sub with short reporting deadlines and lots of adhoc requests so it is difficult, but we are starting to push back. It may require a chat with his manager in diplomatic terms about the future, to check if just a one off.
If it is to continue, he might need to find something else though it is hard knowing the culture in the place before you start. Non unionized salaried employees do not tend to get overtime. We work for the love of it! Ha ha!!!