Note that these books are not for sale but are part of our private collection - however, most are available from Amazon.co.uk or Clarion Shopping.
| Title | Author(s) | Category | Language(s) |
| Obelix And Co | Goscinny & Uderzo | Humour | English |
| Observer's Book Of Astronomy, The | Moore, Patrick | Physics | English |
| Observer's Book Of Automobiles | Observer's Books | Reference | English |
| Octopussy | Fleming, Ian | Fiction | English |
| Odessa File, The | Forsyth, Frederick | Fiction | English |
| Odhams New Atlas Of The World Illustrated | Odhams | Travel | English |
| Odyssey, The | Homer | Literature | English |
| Oeuvres Completes | Moliere, Jean-Baptiste | Drama | French |
| Oeuvres Completes | Racine | Drama | French |
| Official Elizabeth R 1953 Coronation Guide, The | Anon | History | English |
| Official Guide To Wine Snobbery, The | Bernstein, Leonard | Food & Drink | English |
| Official Politically Correct Dictionary And Handbook, The | Beard, Henry & Cerf, Christopher | Humour | English |
| Official Wizard Of Oz Centennial Edition, The | Baum, L Frank | Fiction | English |
| Old Bear | Hissey, Jane | Teddy Bears | English |
| Old Wives' Tale, The | Bennett, Arnold | Fiction | English |
| Omnibus | du Maurier, Daphne | Fiction | English |
| Omnibus | Euripides | Literature | English |
| Omnibus | Greene, Graham | Fiction | English |
| Omnibus | Jerome, Jerome K | Fiction | English |
| Omnibus | Ludlum, Robert | Fiction | English |
| Omnibus | Mann, Thomas | Fiction | English |
| Omnibus | Novalis | Literature | German |
| On The Banks Of Plum Creek | Wilder, Laura Ingalls | Fiction | English |
| Once Upon A Number | Paulos, John Allen | Mathematics | English |
| One Corpse Too Many | Peters, Ellis | Fiction | English |
| One Foot In The Grave | Renwick, David | Entertainment | English |
| One Is Fun | Smith, Delia | Food & Drink | English |
| One More Temps | Kington, Miles | Humour | English |
| One Pot Wonders | Gallagher, Conrad | Food & Drink | English |
| One, Two Buckle My Shoe | Christie, Agatha | Fiction | English |
| One-Way Pendulum | Simpson, N F | Drama | English |
| Op Centre | Clancy, Tom & Pieczenik, Steve | Fiction | English |
| Op Centre - Games Of State | Clancy, Tom & Pieczenik, Steve | Fiction | English |
| Orbiting The Giant Hairball | MacKenzie, Gordon | Miscellaneous | English |
| Ordeal By Innocence | Christie, Agatha | Fiction | English |
| Orient Express | Cookridge, E H | Travel | English |
| Oriental Games | Bell, R C | Games & Puzzles | English |
| Original Canadian Cookbook | Gougeon, Helen | Food & Drink | English |
| Oshawa Project, The | Nolan, Frederick | Fiction | English |
| Osmiroid Book Of Calligraphy, The | Jarman, Christopher | Crafts | English |
| Our Cheque Is In The Post | Ward, Christopher | Miscellaneous | English |
| Our Man In Havana | Greene, Graham | Fiction | English |
| Out Of Africa & Shadows On The Grass | Blixen, Karen | Fiction | English |
| Overcoming Panic | Silove, Derrick & Manicavasagar, Vijaya | Psychology | English |
| Oxford Book Of Exploration, The | Hanbury-Tenison, Robin | Travel | English |
| Oxford Book Of Travel Verse, The | Various | Poetry | English |
| Oxford Companion To English Literature, The | Drabble, Margaret | Reference | English |
| Oxford Companion To The Mind, The | Gregory, Richard | Psychology | English |
| Oxford Dictionary Of Quotations | Book Club Associates | Reference | English |
| Oxford English Guide To The Language | Dear, I C D | Reference | English |
| Oxford Guide To Word Games, The | Augarde, Tony | Games & Puzzles | English |