I had a friend who took BB because she worked 'too much' to earn any significant amount out of PPL. Her and her husband were only in the annual bracket of $70K combined but because she did so many hours per week up until bub was born (may baby), it meant that she was going to get less for the PPL than she would if she took BB. Worked out really stupid for her. So i'd ring up and talk to someone. I think if you work roughly 5-10hours a week normally that PPL works out great and more money for you. If you earn any more or any less you end up not 'qualifying' for the whole amount.
but the PPL isn't means teasted. its just 4 1/2 ish months on minimal wage isn't it? so your income shouldn't affect it? (unless by the end of the financial year you go up an extra tax bracket)