BOAC if I had a problem such as this I would contact my route planning department and ask them, as they should have studied the operation before you launch.If they have not done this I would certainly CHIRP the matter. I am surprised that you are having to resort to an internet forum for this problem. Jep normally provide a separate minima page (-9x? )with Jar minima on when there is a difference in the way the chart has been compiled or they can even provide airline tailored charts.