Photo of Cadbury Chocolate for sake at Tesco Express. This shows that Cadbury is a relevant company. Sir Sloane's chocolate milk inspired the Cadbury brothers.
This source is a page from the source scrapbook this project used but shows a photograph of the Cuca Cocoa Challenge Cup with brief description. Also on this page is a print source with a statement from Shorland describing how he used Cuca Cocoa and enjoys the chocolate they make.