Evan Davis hosts the business ideas challenge, which sees vitamin company CEO Tej Lalvani and cash machine tycoon Jenny Campbell joining returning Dragons Deborah Meaden, Peter Jones and Touker Suleyman to cast an eye over more money-making schemes - with the largest investments in the show's history up for grabs. The first batch of entrepreneurs braving the den present their ideas for an allergy-friendly food range, astroturf for schools and youth centres, and a voucher code website that could revolutionise online shopping.

Tonight it is all about the duos. Two brothers pitch their venture making furniture from old aeroplane parts, a business couple are hoping for investment in their book buying and selling concern and a husband-and-wife team enter the Den with organic dog treats they are hoping are best in show. Finally, two fitness enthusiasts face the multimillionaires with their healthy snacks business, but after a tough workout in the Den will they leave with any Dragon cash?

Bucharest-born Alex hopes his personalised range of luxury leather bags will be the complete package for the Dragons. An ex-policewoman attempts to work up the Dragons' appetite with her range of free from, allergy-friendly frozen curries. And Dorset-based inventor Michael thinks he can ignite the interest of the Dragons with a gadget that keeps opened champagne fizzing. Will his pitch sparkle in the Den or will it fall flat?

Stepping out of the lift doors tonight are former bankers Ben and Andy, whose passion for travel inspired them to kick start their beach towel business. A duo with 40 years of friendship behind them think they have a winning idea with their unique packaging concept all based on air. And finally a serial entrepreneur pitches her family-run novelty plush goods business - but will it be a soft landing when the business goes under scrutiny of the Dragons?

Deborah Meaden, Peter Jones, Touker Suleyman, Tej Lalvani and Jenny Campbell assess the profit-making potential of a space age business venture created by two scientists, an African-inspired range of skincare products, and an online pub quiz app created by a Leeds-based entrepreneur. Evan Davis presents.

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Deborah Meaden, Peter Jones, Touker Suleyman, Tej Lalvani and Jenny Campbell assess the profit-making potential of more business schemes, including an eco mannequin company, a brand of cork-based yoga mats, and a cycling navigation device. Presented by Evan Davis.

Peter Jones, Deborah Meaden, Touker Suleyman, Jenny Campbell and Tej Lalvani take their seats to face the latest batch of entrepreneurs who dare to enter the Den. This week, an athletic entrepreneur hopes he will be in the running for a cash boost for his protein shaker bottle. An engineer from Essex is looking for investment in his home sensor system for the elderly. Finally an Antipodean businesswoman hopes to tempt the Dragons into investing in her gluten-free cakes business. But will anyone walk away with the hoped-for cash?

Will it be the season of goodwill as Peter Jones, Deborah Meaden, Touker Suleyman, Jenny Campbell and Tej Lalvani take their seats to face the latest batch of entrepreneurs who dare to enter Dragons' Den? In this Christmas episode, a serial entrepreneur pitches his online greeting card business, a Surrey-based inventor is hoping his word game could become a family Christmas favourite, and a duo bring their healthy breakfast and snacking products to the Den in the hope of some warm festive cheer. Finally, three brothers pitch for a stake in their men's grooming products - will the Dragons see it as the perfect stocking filler and make a bid for the business?

A former bricklayer is hoping his mortar board invention will help him to build a lucrative relationship with a Dragon, a mother of two enters the Den with a children's tracker device, and an entrepreneur pitches crisps inspired by astronauts. Finally, a 25-year-old brings a Paralympian to the Den to demo her product designed for wheelchair users. But will it be enough to win her an investment?

The Dragons get a good dose of healthy products for man and beast. A business duo hope to stand out from the crowd with their natural raw dog food, a doctor pitches his innovative date-based smoothie and a London entrepreneur wants to get the Dragons' hearts pumping with his unique free-running exercise regime. But will the adrenalin rush leave the Dragons fighting to invest?

In this episode, three dynamic duos make an entrance. First up a female entrepreneurial pair pitch their nifty solution to pain caused from wearing halter neck straps. Another team of two make an impact with their innovative skin care products made from hemp. And a couple of entrepreneurs hope to seal a deal with their language learning story books for kids. But who will walk away with some Dragon cash?

Jenny Campbell, Peter Jones, Touker Suleyman, Deborah Meaden and Tej Lalvani assess the profit-making potential of a young entrepreneur's plan for selling advertising space on the move, a teacher's unusual scheme for improving children's handwriting, and a range of chain-tensioning products for motorcycles.

Deborah Meaden, Peter Jones, Touker Suleyman, Tej Lalvani and Jenny Campbell assess the profit-making potential of a final batch of business plans, including an idea for a child's toothbrush that doubles as a mobile game controller, a range of Scottish gins, and a device for relieving back pain. Last in the series.