One Woman's War : THE SECOND BOOK IN THE SUNDAY TIMES BESTSELLING RAGS TO RICHES SERIES (by Rosie Goodwin)

Onyeka and the Rise of the Rebels : A superhero adventure perfect for Marvel and DC fans! (by Tola Okogwu)

Onyx Storm : DISCOVER THE FOLLOW-UP TO THE GLOBAL PHENOMENONS, FOURTH WING AND IRON FLAME! (by Rebecca Yarros)

Oodles of Poodles : A riotous read-aloud story to make toddlers and children giggle, perfect for ages 2, 3, 4, 5 (by Rachel Morrisroe)

Ootlin (by Dr Jenni Fagan)

Open After Dark (by Sue Proffitt)

Operation Mincemeat : The True Spy Story that Changed the Course of World War II (by Ben Macintyre)

Opt Out (by Carolina Setterwall)

Optionality : How to Survive and Thrive in a Volatile World (by Richard Meadows)

Oral History of Atlantis, An : Stories (by Ed Park)

Orangeboy (by Patrice Lawrence)

Orator : The Life of Cicero and the End of the Roman Republic (by Catharine Edwards)

Ordinary Morning Sunlight (by Christopher Reid)

Orientalism (by Edward W. Said)

Origami Fortune Tellers (by Lucy Bowman)

Origins of The Wheel of Time : The Legends and Mythologies that Inspired Robert Jordan (by Michael Livingston)

Orkney : Megalithic Marvel of the Northern Isles (by Hector McDonnell)

Orlando the Marmalade Cat: A Camping Holiday (by Kathleen Hale)

Other Minds : The Octopus and the Evolution of Intelligent Life (by Peter Godfrey-Smith)

Ottolenghi SIMPLE (by Yotam Ottolenghi)

Ottolenghi SIMPLE TOO (by Yotam Ottolenghi)

Ottoline Goes to School (by Chris Riddell)

Our Better Natures (by Sophie Ward)

Our Brains, Our Selves : What a Neurologist’s Patients Taught Him About the Brain (by Masud Husain)

Our Haunted Shores : Tales from the Coasts of the British Isles : 31 (by Emily Alder)

Our Missing Hearts : ‘Will break your heart and fire up your courage’ Mail on Sunday (by Celeste Ng)

Our New Baby : A Book for You about Your New Brother or Sister (by Rachel Greener)

Our Noble Selves (by Kate Atkinson)

Our Strange Duet (by Erin A. Craig)

Our Wicked Histories (by Amy Goldsmith)

OUT & ABOUT MAP of the SOUTH WEST : The Ultimate Guide to the SW (by OUT & ABOUT MAPS LIMITED)

Out and About : A First Book of Poems (by Shirley Hughes)

Out of Colditz : My Father the POW and the Nazi who Controlled his Fate (by David Lascelles)

Out of Darkness : Book 21 in the Sunday Times bestselling DSI William Lorimer series (by Alex Gray)

Out Of Place : A Memoir (by Edward W. Said)

Outlaw : The incredible new thriller from the master of modern espionage (by James Swallow)

Outlaw Planet : Winner of the Philip K. Dick Award - the wild, exhilarating SF adventure (by M.R. Carey)

Over the Rainbow : Tales from an Unexpected Year (by Alex James)

Over the Rainbow Bridge : The debut picture book from the nation's favourite SUPERVET (by Noel Fitzpatrick)

Over Work : Transforming the daily grind in the quest for a better life (by Brigid Schulte)

Overwhelmed : Ways to Take the Pressure Off (by Claudia Hammond)

Owl and Moon (by Kate Rolfe)

Owl King : Faery Realms series: The darkly enchanting YA fantasy (by Bex Hogan)

Owl’s Lesson (by Nick Butterworth)

Owning It : In My Own Words (by Andy Carroll)

Oxford Children's Classics: Black Beauty (by Anna Sewell)

Oxford Playscripts: Frankenstein (by Mary Shelley)

Oxford School Dictionary & Thesaurus (by Oxford Dictionary)