Young entrepreneur John Buni from London brings futuristic laser beams into the Den. His modern take on tailoring uses a laser body scanner to collect measurements for bespoke suits. The Dragons know all about fine tailoring, but will this idea measure up? A father and son duo have invented a plastic vest to help gym-goers lose weight as they work up a sweat. Now they want the Dragons to see the potential in their idea and help them gain the extra pounds they need in investment. Plus, a website venture supplying vehicle accessories is ready for the extra push a Dragon investor can bring, and serial inventor Solvej Biddle brings her latest innovative idea into the Den. It's a backpack that converts into a travel play-kit for children - a tough market to crack, but she thinks she has what it takes to convince a Dragon to help fast-track it to success.

• Evan Davis
• Tej Lalvani
• Sara Davies