Generally we've gone for subjects that lend themselves to 'rakes' (like the mk2b's so you can assemble a complete train from a few packs). The pack idea lets us increase the volume we will sell, reduce packing and shipping costs (we ship less 'air' across the world) and makes the RRP lower. Our latest HUO run, is a triple pack at just £69.95 for three, when our larger competition are selling older tooled, single wagons at £35-45 each, versus the £23 each we can do the HUO for