I thought navy flakes, by definition, are topped with rum, or is rum not considered a topping?Plum pudding is an aromatic so they case the tobaccos first with flavors etc.. then in the end spray it with a "topping" that adds more flavor. These are all liquids so you see where the moisture can come from.
Navy flake has casing on the tobaccos for flavor, but then is pressed (and with MacBaren I believe heated, too) and then sliced. No additional toppings after it's pressed.
Also, PP an aromatic? I've only had the Special Reserve but, man, I don't remember it being an aromatic (English/Balkan).