Meredith Costain

Ella Diaries
   1. Double Dare You (2018)
   2. Ballet Backflip (2015)
   3. I Heart Pets (2016)
   4. Dreams Come True (2016)
   5. Christmas Chaos (2015)
   6. Pony School Showdown (2015)
   7. Friends Not Forever (2019)
   8. Worst Camp Ever (2018)
   9. Operation Merry Christmas (2020)
   10. Friendship S.O.S. (2021)
   11. Going Green (2021)
   12. Total TV Drama (2018)
   13. Goal Power (2018)
   14. Diary Disaster (2018)
   15. The Super Secret Club (2019)
   16. Gym Squad Tumble (2019)
   17. Time to Shine (2019)
   18. Wildlife Rescue (2020)
   19. Passion for Fashion (2023)
   20. Christmas Crackers (2020)
   21. Diva Drama (2021)
   22. Camp Gold Rush (2021)
   23. Spooky Surprise (2021)
   24. Dolphin Dreaming (2022)
   25. Museum Mayhem (2022)
   26. Fundraising Frenzy (2022)
   27. Flash Mob Fever (2023)
   28. Sleepover FAIL (2024)
   29. Wedding Belles (2024)
   30. Adventure Island (2024)
   31. Netball Rules (2025)

Ella Diaries Super Special
   1. Winter Wonders (2023)
   2. Goal Power (2018)
   3. Treasure Trail (2025)

Olivia's Secret Scribbles
   1. My New Best Friend (2018)
   2. My (Almost) Perfect Puppy (2019)
   3. Amazing Acrobats (2019)
   4. Super Science Stars (2018)
   5. The Big Chicken Mystery (2019)
   6. Box Car Racers (2019)
   7. Music Makers (2019)
   My Best Christmas Ever (2019)
   8. Dragon Catchers (2023)
   9. Unicorn Parade (2023)
   10. Fairy Cakes (2021)
   11. Splash! (2022)
   12. The Marvellous Magic Show (2023)

   Spaced Out! (1999) (with Paul Collins)
   The PM's Daughter (2022)

   Spinouts Bronze and Silver (1999) (with Paul Collins)