Watch Dragons' Den Season 15 Online

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.