K. J. Gray (Barrister, Fellow of Trinity College, Professor of Law, University of Cambridge)

Penny, a 1 pence coin, is friends with Tuppence, a 2p coin. The two are best friends and sit happily in a purse until their owner goes shopping and the two get split up! Tuppence ends up in a shop till, where the coin meets a third coin named Tilly, an older and wiser coin, who explains to Tuppence ...