The concluding chapter of the three-part film series which started with My Fault: London and has been following the forbidden romance between Noah and her stepbrother Nick. In Our Fault: London, Noah and Nick face events that will force them to make a final decision: are they meant to be together or should they part ways?
| Actor | Role |
|---|---|
 Matthew BroomeNick | Nick |
 Asha BanksNoah | Noah |
 Louisa BinderSophia | Sophia |
 Joel NankervisMichael | Michael |
 Scarlett RaynerBriar | Briar |
 Eve MacklinElla | Ella |
| HHamish FrewSimon | Simon |
 Seosaimhin HennellyMaddie | Maddie |
 Samuel Edward-CookRay | Ray |
 Kerim HassanLion | Lion |
 Asmara GabrielleCassandra Jones | Cassandra Jones |
 Bre FrancisMilly | Milly |
 Patrick PearsonOffice Worker | Office Worker |
| JJohn HewsonLuca | Luca |