Which guest Dragon invested in Tom Pellereau's Stylfile on Dragon's Den?

Lord Alan Sugar invested in Tom Pellereau's Stylfile on Dragon's Den. Sugar joined the panel as a guest Dragon for the episode in which Pellereau presented his curved nail-care tools.

The Stylfile range was designed to address the awkwardness of filing and painting nails. Pellereau's demonstration showed how the shape could help users reach the edge of a nail more easily, giving the product a clear practical proposition.

Sugar is best known as the founder of Amstrad and as the star of The Apprentice, rather than as a regular Dragon. That makes this investment easy to confuse with deals made by the programme's permanent panel members.

Pellereau and Sugar's agreement became one of the show's recognisable product successes, linking a consumer invention with an experienced technology and retail entrepreneur.