Variety is the spice of life in the Den in this episode - edible insects give some of the Dragons the creeps, a couple of young entrepreneurs look sharp with their bespoke suit-tailoring business and an eco skip on wheels causes confusion in the ranks. Will a registered nurse gain investment for her life-saving product, or will the Dragons have more enthusiasm for a Scottish energy-drinks business? With Duncan saying farewell to the Den tonight, let's hope he goes out on a high...