diff --git a/data/language/en-GB.txt b/data/language/en-GB.txt
index 7997547cdc..73618a460e 100644
--- a/data/language/en-GB.txt
+++ b/data/language/en-GB.txt
@@ -3651,6 +3651,8 @@ STR_6450    :{BLACK}“{STRING}”
 STR_6451    :{BLACK}“{STRING}” - {STRING}
 STR_6452    :{WINDOW_COLOUR_2}Sells: {BLACK}{STRING}
 STR_6453    :Copy version info
+STR_6454    :Can’t rename banner…
+STR_6455    :Can’t rename sign…
 
 #############
 # Scenarios #
diff --git a/src/openrct2/actions/BannerPlaceAction.cpp b/src/openrct2/actions/BannerPlaceAction.cpp
index 28a029cc40..88e6860d27 100644
--- a/src/openrct2/actions/BannerPlaceAction.cpp
+++ b/src/openrct2/actions/BannerPlaceAction.cpp
@@ -38,7 +38,7 @@ BannerPlaceActionResult::BannerPlaceActionResult(GameActions::Status err, rct_st
 {
 }
 
-BannerPlaceAction::BannerPlaceAction(const CoordsXYZD& loc, uint8_t bannerType, uint8_t primaryColour)
+BannerPlaceAction::BannerPlaceAction(const CoordsXYZD& loc, ObjectEntryIndex bannerType, colour_t primaryColour)
     : _loc(loc)
     , _bannerType(bannerType)
     , _primaryColour(primaryColour)
diff --git a/src/openrct2/actions/BannerPlaceAction.h b/src/openrct2/actions/BannerPlaceAction.h
index 94d9e7feb3..c4195a18ca 100644
--- a/src/openrct2/actions/BannerPlaceAction.h
+++ b/src/openrct2/actions/BannerPlaceAction.h
@@ -31,7 +31,7 @@ private:
 
 public:
     BannerPlaceAction() = default;
-    BannerPlaceAction(const CoordsXYZD& loc, uint8_t bannerType, uint8_t primaryColour);
+    BannerPlaceAction(const CoordsXYZD& loc, ObjectEntryIndex bannerType, colour_t primaryColour);
 
     void AcceptParameters(GameActionParameterVisitor & visitor) override;
 
diff --git a/src/openrct2/actions/BannerSetNameAction.cpp b/src/openrct2/actions/BannerSetNameAction.cpp
index 765acecb42..393fc3e3ad 100644
--- a/src/openrct2/actions/BannerSetNameAction.cpp
+++ b/src/openrct2/actions/BannerSetNameAction.cpp
@@ -48,7 +48,7 @@ GameActions::Result::Ptr BannerSetNameAction::Query() const
     if (banner == nullptr)
     {
         log_warning("Invalid banner id, banner id = %d", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_RENAME_BANNER, STR_NONE);
     }
     return MakeResult();
 }
@@ -59,7 +59,7 @@ GameActions::Result::Ptr BannerSetNameAction::Execute() const
     if (banner == nullptr)
     {
         log_warning("Invalid banner id, banner id = %d", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_RENAME_BANNER, STR_NONE);
     }
 
     banner->text = _name;
diff --git a/src/openrct2/actions/BannerSetStyleAction.cpp b/src/openrct2/actions/BannerSetStyleAction.cpp
index 035b2bb3e7..6407112795 100644
--- a/src/openrct2/actions/BannerSetStyleAction.cpp
+++ b/src/openrct2/actions/BannerSetStyleAction.cpp
@@ -50,7 +50,7 @@ GameActions::Result::Ptr BannerSetStyleAction::Query() const
     if (banner == nullptr)
     {
         log_error("Invalid banner index: index = %u", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     res->Expenditure = ExpenditureType::Landscaping;
@@ -62,7 +62,7 @@ GameActions::Result::Ptr BannerSetStyleAction::Query() const
     if (tileElement == nullptr)
     {
         log_error("Could not find banner index = %u", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     switch (_type)
@@ -86,12 +86,12 @@ GameActions::Result::Ptr BannerSetStyleAction::Query() const
             if (tileElement->AsBanner() == nullptr)
             {
                 log_error("Tile element was not a banner.");
-                return MakeResult(GameActions::Status::Unknown, STR_NONE);
+                return MakeResult(GameActions::Status::Unknown, STR_CANT_REPAINT_THIS);
             }
             break;
         default:
             log_error("Invalid type: %u", _type);
-            return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+            return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
     return res;
 }
@@ -104,7 +104,7 @@ GameActions::Result::Ptr BannerSetStyleAction::Execute() const
     if (banner == nullptr)
     {
         log_error("Invalid banner index: index = %u", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     res->Expenditure = ExpenditureType::Landscaping;
@@ -116,7 +116,7 @@ GameActions::Result::Ptr BannerSetStyleAction::Execute() const
     if (tileElement == nullptr)
     {
         log_error("Could not find banner index = %u", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     switch (_type)
@@ -133,7 +133,7 @@ GameActions::Result::Ptr BannerSetStyleAction::Execute() const
             if (bannerElement == nullptr)
             {
                 log_error("Tile element was not a banner.");
-                return MakeResult(GameActions::Status::Unknown, STR_NONE);
+                return MakeResult(GameActions::Status::Unknown, STR_CANT_REPAINT_THIS);
             }
 
             banner->flags &= ~BANNER_FLAG_NO_ENTRY;
@@ -148,7 +148,7 @@ GameActions::Result::Ptr BannerSetStyleAction::Execute() const
         }
         default:
             log_error("Invalid type: %u", _type);
-            return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+            return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     auto intent = Intent(INTENT_ACTION_UPDATE_BANNER);
diff --git a/src/openrct2/actions/SignSetNameAction.cpp b/src/openrct2/actions/SignSetNameAction.cpp
index d13941edd7..92b9145ab7 100644
--- a/src/openrct2/actions/SignSetNameAction.cpp
+++ b/src/openrct2/actions/SignSetNameAction.cpp
@@ -49,7 +49,7 @@ GameActions::Result::Ptr SignSetNameAction::Query() const
     if (banner == nullptr)
     {
         log_warning("Invalid game command for setting sign name, banner id = %d", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_RENAME_SIGN, STR_NONE);
     }
     return MakeResult();
 }
@@ -60,7 +60,7 @@ GameActions::Result::Ptr SignSetNameAction::Execute() const
     if (banner == nullptr)
     {
         log_warning("Invalid game command for setting sign name, banner id = %d", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_RENAME_SIGN, STR_NONE);
     }
 
     if (!_name.empty())
diff --git a/src/openrct2/actions/SignSetStyleAction.cpp b/src/openrct2/actions/SignSetStyleAction.cpp
index de79708f6b..e38319c71d 100644
--- a/src/openrct2/actions/SignSetStyleAction.cpp
+++ b/src/openrct2/actions/SignSetStyleAction.cpp
@@ -43,7 +43,7 @@ GameActions::Result::Ptr SignSetStyleAction::Query() const
     if (banner == nullptr)
     {
         log_error("Invalid banner id. id = ", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     if (_isLarge)
@@ -52,12 +52,12 @@ GameActions::Result::Ptr SignSetStyleAction::Query() const
         if (tileElement == nullptr)
         {
             log_warning("Invalid game command for setting sign style, banner id '%d' not found", _bannerIndex);
-            return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+            return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
         }
         if (tileElement->GetType() != TILE_ELEMENT_TYPE_LARGE_SCENERY)
         {
             log_warning("Invalid game command for setting sign style, banner id '%d' is not large", _bannerIndex);
-            return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+            return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
         }
     }
     else
@@ -67,7 +67,7 @@ GameActions::Result::Ptr SignSetStyleAction::Query() const
         if (!wallElement)
         {
             log_warning("Invalid game command for setting sign style, banner id '%d' not found", _bannerIndex);
-            return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+            return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
         }
     }
 
@@ -80,7 +80,7 @@ GameActions::Result::Ptr SignSetStyleAction::Execute() const
     if (banner == nullptr)
     {
         log_error("Invalid banner id. id = ", _bannerIndex);
-        return MakeResult(GameActions::Status::InvalidParameters, STR_NONE);
+        return MakeResult(GameActions::Status::InvalidParameters, STR_CANT_REPAINT_THIS);
     }
 
     CoordsXY coords = banner->position.ToCoordsXY();
@@ -92,7 +92,7 @@ GameActions::Result::Ptr SignSetStyleAction::Execute() const
                 { coords, tileElement->GetBaseZ(), tileElement->GetDirection() },
                 tileElement->AsLargeScenery()->GetSequenceIndex(), _mainColour, _textColour))
         {
-            return MakeResult(GameActions::Status::Unknown, STR_NONE);
+            return MakeResult(GameActions::Status::Unknown, STR_CANT_REPAINT_THIS);
         }
     }
     else
diff --git a/src/openrct2/localisation/StringIds.h b/src/openrct2/localisation/StringIds.h
index 0671d62036..8a4a4ab5e2 100644
--- a/src/openrct2/localisation/StringIds.h
+++ b/src/openrct2/localisation/StringIds.h
@@ -3905,6 +3905,9 @@ enum
 
     STR_COPY_BUILD_HASH = 6453,
 
+    STR_CANT_RENAME_BANNER = 6454,
+    STR_CANT_RENAME_SIGN = 6455,
+
     // Have to include resource strings (from scenarios and objects) for the time being now that language is partially working
     /* MAX_STR_COUNT = 32768 */ // MAX_STR_COUNT - upper limit for number of strings, not the current count strings
 };
diff --git a/src/openrct2/world/Banner.cpp b/src/openrct2/world/Banner.cpp
index 049540f4f0..f51937f5bf 100644
--- a/src/openrct2/world/Banner.cpp
+++ b/src/openrct2/world/Banner.cpp
@@ -424,8 +424,8 @@ Banner* CreateBanner()
         banner->flags = 0;
         banner->type = 0;
         banner->text = {};
-        banner->colour = 2;
-        banner->text_colour = 2;
+        banner->colour = COLOUR_WHITE;
+        banner->text_colour = COLOUR_WHITE;
     }
     return banner;
 }