literally hundreds of titles currently in print, we actually only have six titles with this kind of titling". Its parent company, Penguin Random House Children's division, would also be following suit. Imprints of Ladybird Books included Balloon, Paperbird, Sunbird, and Disney. In October 2015, it was announced that Ladybird books would be publishing its first series of books for adults. The eight books, which parody the style and artwork of the company’s books for children, include the titles The Hangover, Mindfulness, Dating and The Hipster, and were written by television comedy writers Jason Hazeley and Joel Morris. They were published on 18 November 2015. The series follows a trend of other spoof Ladybird books including We Go to the Gallery by Miriam Elia who had previously been threatened with legal action by Penguin. On 5 July 2016, Touchstone Books, an imprint of Simon & Schuster, announced that they would publish American adaptations of the Ladybird Books for Grown-ups, called The Fireside Grown-Up Guides. Ladybird Expert (Series 117) was launched in January 2017 following the success of Ladybird for Grown-Ups. The books in this series are not parodies, but instead use the classic format to serve as clear introductions to a wide variety of subjects, generally in the fields of science and history. The first book published and the inspiration for the series is Climate Change by the Prince of Wales, Tony Juniper and Emily Shuckburgh. Four more titles were released in 2017 by Jim Al-Khalili (Quantum Mechanics), Steve Jones (Evolution), James Holland (The Battle of Britain) and Ben Saunders (Shackleton). The line was expanded with fifteen further books in 2018 and more titles were published in 2019. The classic Ladybird book The pocket-sized hardback Ladybird measured roughly four-and-a-half by seven inches (11.5 cm by 18 cm). Early books used a standard 56-page format, chosen because a complete book could be printed on one large standard sheet of paper, a quad crown, 40 inches by 30 inches, which was then folded and cut to size without waste paper. It was an economical way of producing books, enabling the books to be retailed at a low price which, for almost thirty years, remained at two shillings and sixpence (12.5p). The first book in the line, Bunnikin's Picnic Party: a story in verse for children with illustrations in colour, was produced in 1940. The book featured stories in verse written by W. Perring,