Sorry AlphaMale, but as far as I can see, Rule 37 part 4(c) says
"a flying machine which is being overtaken shall have the right-of-way, and the overtaking flying machine shall keep out of the way of the other flying machine by altering its course to the left until that other flying machine has been passed and is clear, notwithstanding any change in the relative positions of the two flying machines."
Which sounds to me like you should overtake on the left, so the original question stands. And in response to the question - I have no idea.