Guy Barter is the Chief Horticultural Advisor of the Royal Horticultural Society, having joined the organisation as superintendent of trials at RHS Garden Wisley in 1990.

Prior to that, he gained experience in the commercial horticultural world after graduating with a degree in horticulture.

Guy now runs the RHS Members' Advisory Service, which provides answers to an enormous range of questions and supplies evidence-based advice for thousands of gardeners.

Sam Falconer's illustrations combining vibrant characters and intricate environments have been commissioned by clients ranging from leading national newspapers to renowned science magazines and universities.

Initially working purely by hand, Sam discovered a passion for digital collage in 2010 which later developed into his own unique brand of rich and detailed imagery.

This method allows him to develop complex pieces with diverse character sets each distinct from one another. Sam was featured in IdN magazine's New Faces of Inspiration issue as one of ten leading illustrators in the editorial field.