All you need is one brief encounter with a British cookbook (or the other way around, depending on where you live) to realize that not only is marrow = zucchini = courgette, but aubergine = eggplant, and the measuring systems are quite different.

However, it is worth the effort for me, as my two favourite cookbooks (a giant Italian one and a Turkish one) are both British...I am willing to look up what 1 pound of flour is in cups (I have no kitchen scale!) to get to the delectable end result...