diff --git a/anonymiser/registry.py b/anonymiser/registry.py
index 21e67a7..7383eb7 100644
--- a/anonymiser/registry.py
+++ b/anonymiser/registry.py
@@ -18,12 +18,9 @@ def sort_by_name(models: list[type[models.Model]]) -> list[type[models.Model]]:
 
 
 class Registry(dict):
-    def anonymisable_models(self) -> list[type[models.Model]]:
+    def get_anonymisable_models(self) -> list[type[models.Model]]:
         return sort_by_name([m for m in self.keys() if self[m]])
 
-    def non_anonymisable_models(self) -> list[type[models.Model]]:
-        return sort_by_name([m for m in self.keys() if self[m] is None])
-
     def is_model_anonymisable(self, model: type[models.Model]) -> bool:
         return bool(self[model])
 
@@ -48,6 +45,11 @@ def get_model_anonymiser(model: type[models.Model]) -> ModelAnonymiser | None:
     return None
 
 
+def get_anonymisable_models() -> list[type[models.Model]]:
+    """Return all models that have an anonymiser."""
+    return _registry.get_anonymisable_models()
+
+
 def get_all_model_fields(
     anonymised_only: bool = False,
 ) -> dict[str, list[ModelFieldSummary]]:
@@ -73,5 +75,5 @@ def get_all_model_fields(
     return dict(output)
 
 
-# Registry object - initialised in init_registry()
-_registry: Registry = Registry()
+# principle access point for the registry
+_registry = Registry()