Discovering hidden horticulturists, meeting the people in purple and fabulous floral art

This week we uncover untold histories of 19th-century gardeners with Fiona Davison, author and Head of Libraries and Collections at the RHS. Then we head out into the Chelsea crowds to meet Sue and Steve Hall who are part of our purple-clad cadre of volunteers; un-sung modern day gardening heroes who help run the RHS Flower Shows – they share what volunteering means to them. Plus a look at the incredible floral art from the National Association of Flower Arranging Societies (NAFAS) as the organisation celebrates its 70th year.