Caroline Taggart worked in publishing as an editor of popular non-fiction for thirty years before being asked by Michael O'Mara Books to write I Used to Know That, which became a Sunday Times bestseller. Following that she was co-author of My Grammar and I (or should that be 'Me'?), and wrote a number of other books about words and English usage. She has appeared frequently on television and on national and regional radio, talking about language, grammar and whether or not Druids Cross should have an apostrophe.Her website is carolinetaggart.co.uk and you can follow her on Twitter @citaggart.

Will help you get to grips with the true meanings and origins of our popular expressions