These were blank backed cards, and they are sometimes referred to as "Thirty Years of The Chimps". You can also, if you are lucky, come across thinner stickers which have "TAK TIK" on the back. Tak Tik was a company which produced self adhesive labels, and their branding appeared on the paper covering that was removed to reveal the sticky surface beneath.
Cyril the Cyclist might have been in honour of Cyril Peacock, as seen in our last section, or not, but he was very popular, appearing on many tie in products, including tea towels, though many of those items showed an actual chimpanzee, dressed up. Our cards, being drawn, are more in keeping with my more animal friendly beliefs. Cyril referenced the Tour de France, and was an attempt to tie in with sport, in fact another card of the set shows Jean Pierre Berke, a motor racing driver. And as you might imagine, Brooke Bond, a spy, but no relation to James, was also featured. .