diff --git a/apps/opencs/model/world/collection.hpp b/apps/opencs/model/world/collection.hpp
index 156c5f9c71..ad8d3690b8 100644
--- a/apps/opencs/model/world/collection.hpp
+++ b/apps/opencs/model/world/collection.hpp
@@ -100,7 +100,7 @@ namespace CSMWorld
     public:
         Collection();
 
-        virtual ~Collection();
+        ~Collection() override;
 
         void add(const ESXRecordT& record);
         ///< Add a new record (modified)
@@ -119,10 +119,10 @@ namespace CSMWorld
 
         const ColumnBase& getColumn(int column) const override;
 
-        virtual void merge();
+        void merge();
         ///< Merge modified into base.
 
-        virtual void purge();
+        void purge();
         ///< Remove records that are flagged as erased.
 
         void removeRows(int index, int count) override;
diff --git a/apps/opencs/model/world/refcollection.cpp b/apps/opencs/model/world/refcollection.cpp
index fbe002080c..1479e82286 100644
--- a/apps/opencs/model/world/refcollection.cpp
+++ b/apps/opencs/model/world/refcollection.cpp
@@ -276,19 +276,6 @@ void CSMWorld::RefCollection::removeRows(int index, int count)
     }
 }
 
-void CSMWorld::RefCollection::appendBlankRecord(const std::string& id, UniversalId::Type type)
-{
-    auto record = std::make_unique<Record<CellRef>>();
-
-    record->mState = Record<CellRef>::State_ModifiedOnly;
-    record->mModified.blank();
-
-    record->get().mId = ESM::RefId::stringRefId(id);
-    record->get().mIdNum = extractIdNum(id);
-
-    Collection<CellRef>::appendRecord(std::move(record));
-}
-
 void CSMWorld::RefCollection::appendBlankRecord(const ESM::RefId& id, UniversalId::Type type)
 {
     auto record = std::make_unique<Record<CellRef>>();
@@ -316,11 +303,6 @@ void CSMWorld::RefCollection::cloneRecord(
     insertRecord(std::move(copy), getAppendIndex(destination, type)); // call RefCollection::insertRecord()
 }
 
-int CSMWorld::RefCollection::searchId(std::string_view id) const
-{
-    return searchId(extractIdNum(id));
-}
-
 int CSMWorld::RefCollection::searchId(const ESM::RefId& id) const
 {
     return searchId(extractIdNum(id.getRefIdString()));
diff --git a/apps/opencs/model/world/refcollection.hpp b/apps/opencs/model/world/refcollection.hpp
index 066e5ec3d9..a5e5fd3b6f 100644
--- a/apps/opencs/model/world/refcollection.hpp
+++ b/apps/opencs/model/world/refcollection.hpp
@@ -34,7 +34,7 @@ namespace CSMWorld
     void Collection<CellRef>::insertRecord(std::unique_ptr<RecordBase> record, int index, UniversalId::Type type);
 
     /// \brief References in cells
-    class RefCollection : public Collection<CellRef>
+    class RefCollection final : public Collection<CellRef>
     {
         Collection<Cell>& mCells;
         std::map<unsigned int, int> mRefIndex; // CellRef index keyed by CSMWorld::CellRef::mIdNum
@@ -61,20 +61,19 @@ namespace CSMWorld
 
         std::string getNewId();
 
-        virtual void removeRows(int index, int count);
+        void removeRows(int index, int count) override;
 
-        virtual void appendBlankRecord(const std::string& id, UniversalId::Type type = UniversalId::Type_None);
-        virtual void appendBlankRecord(const ESM::RefId& id, UniversalId::Type type = UniversalId::Type_None);
+        void appendBlankRecord(const ESM::RefId& id, UniversalId::Type type = UniversalId::Type_None) override;
 
-        virtual void cloneRecord(const ESM::RefId& origin, const ESM::RefId& destination, const UniversalId::Type type);
+        void cloneRecord(
+            const ESM::RefId& origin, const ESM::RefId& destination, const UniversalId::Type type) override;
 
-        virtual int searchId(std::string_view id) const;
-        virtual int searchId(const ESM::RefId& id) const;
+        int searchId(const ESM::RefId& id) const override;
 
-        virtual void appendRecord(std::unique_ptr<RecordBase> record, UniversalId::Type type = UniversalId::Type_None);
+        void appendRecord(std::unique_ptr<RecordBase> record, UniversalId::Type type = UniversalId::Type_None) override;
 
-        virtual void insertRecord(
-            std::unique_ptr<RecordBase> record, int index, UniversalId::Type type = UniversalId::Type_None);
+        void insertRecord(
+            std::unique_ptr<RecordBase> record, int index, UniversalId::Type type = UniversalId::Type_None) override;
     };
 }
 
diff --git a/apps/opencs/model/world/subcellcollection.hpp b/apps/opencs/model/world/subcellcollection.hpp
index 88df21b4d4..f7cb896aca 100644
--- a/apps/opencs/model/world/subcellcollection.hpp
+++ b/apps/opencs/model/world/subcellcollection.hpp
@@ -14,7 +14,7 @@ namespace CSMWorld
 
     /// \brief Single type collection of top level records that are associated with cells
     template <typename ESXRecordT>
-    class SubCellCollection : public NestedIdCollection<ESXRecordT>
+    class SubCellCollection final : public NestedIdCollection<ESXRecordT>
     {
         const IdCollection<Cell>& mCells;