Other major products by PBI are the Expert range of books, such as the Garden Expert, House Plant Expert, Greenhouse Expert etc. written by, Dr D.G. Hessayon, who later became chairman of PBI. The motto of these books is "Easy-to-follow advice and information you can trust". With this in mind they are colourful, informative, and contain accurate product information and literature.[2] The Company adopted this approach throughout all its products and brands.