Peter Jones, Deborah Meaden, Touker Suleyman, Sara Davies and new investor Steven Bartlett face another selection of hopeful entrepreneurs. They include an ethically minded couple who have some planet-saving ideas to transform the DIY market, a mother with an invention borne from her own sleepless nights, a pair of beauty product designers hoping to tackle the problem of plastic in the bathroom, and an animal lover from Canada with a green solution to canine pollution.