As three new fire breathers enter the Den, Sarah Millican takes us through 10 years of the show, neatly compiled into an A to Z guide.

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...

This episode sees a couple of young stuntmen glide in to the Den on a new form of transportation and a Scottish entrepreneur present a subscription box of foodie treats. A father-and-son team demonstrate their new safety device for boats, and a homemade marmalade brand tries to whet the Dragons' appetite. Will anyone manage to walk away with a deal?

The Dragons test out an alarmed anti-piracy device for sailors, have a play with a children's bike horn and get a taste of the Orient with a new East Asian-flavoured ice cream brand. A Scottish entrepreneur pitches his new shopping app and a family business try to appeal to the Dragons' softer sides with their subscription boxes for babies. Can anyone walk away with a deal?

This episode opens on a theatrical note with a young actress-come-entrepreneur pitching her 'pimped-up heels', and a Yorkshire duo decide to set out a market stall to trade in the Den. The Dragons are faced with five eco-friendly coffins, get to grips with a sleek new electric toothbrush and meet a pop star's daughter with an online shopping service for men. Will anyone walk away with a deal, or will the curtains come down on their investment hopes?

Inventions galore in the Den - Kelly gets an unusual phone call from outside the Den, a mother-and-daughter duo pitch their children's waterproof products and a trio of break dancers introduce the Dragons to some innovative earphones. Aside from the fun of being serenaded by a group of princesses and having a go on a modern day penny-farthing, will the Dragons feel the need to invest?

The Den is full of eye-catching businesses - male leggings, hi-vis sportswear, sandwich boards with a difference and an energy-efficient light bulb all come up against the Dragons' scrutiny. Alongside that, a young photo-booth company offers the Dragons the chance to capture their time in the Den, and Deborah takes a stroll on a lawn to test out a new stiletto accessory. Will anyone leave the Den with a Dragon on board, or will it be lights out on their investment hopes?

There are some true inventors in the Den this episode, including a returning entrepreneur with a new outdoor space saving device, a golfing duo with a new take on the traditional tee, and a designer who has flipped the conventional umbrella on its head. The Dragons come face to face with a fellow multimillionaire and the Den is filled with children's teepees.

An 18-year-old seeks to impress the Dragons with his garden shed invention. There is also a canine member of Team GB and a rip-roaring entrance from a Kent-based gaming entrepreneur. Also, a couple of likely lads showcase their blooming marvellous greetings product and the Dragons get a taste of Colombia's finest cacao.

Sticky business in the Den: a product using nano suction technology has the Dragons glued, there's an alarmed LED walking stick and a marshmallow lover lets the Dragons get sticky fingers with her gourmet treats. For those who overindulge, there is a cycling brand for the larger figure, and the Dragons are invited to play with a new keepy-uppy toy. Will anyone be able to cement a deal?

A couple of university friends pitch their home-brew cider kits hoping to leave the Den victorious, and a loose-leaf tea company serve up a refreshing treat. The lift encounters a technical malfunction, and a former Economics student hopes to butter up the Dragons with his new nutty preserve. Will anyone walk away with a deal?

The Dragons encounter a colourful Indian dance troupe and the weird and wonderful world of taxidermy and a young Yorkshire duo try to impress Peter Jones by eating their own product - dog food.

Dragons' Den returns and the action kicks off with a toe-tapping pitch seeing the Dragons up on their feet. Also in this episode, Deborah goes for a slightly unconventional joy ride, and Peter Jones thinks outside the frame with an offer the Den has never seen before. Will anyone be able to entice the Dragons and secure that all-important investment?