diff --git a/model_data/BaseUtility.py b/model_data/BaseUtility.py
index 2474e517..c6934da1 100644
--- a/model_data/BaseUtility.py
+++ b/model_data/BaseUtility.py
@@ -8,6 +8,7 @@ class BaseUtility:
         # Invalid reports are where the value provided is out of bounds, e.g. a negative energy rating of -1199 or a
         # non-integer, there is no valid energy band for this, so it is marked as INVALID!
         "INVALID",
+        "INVALID!",
         # When the energy certificate was first lodged on the register there was no requirement to lodge this data
         # item, i.e. a non-mandatory item.
         "NO DATA!",
diff --git a/model_data/app.py b/model_data/app.py
index 90dc158a..289b2a67 100644
--- a/model_data/app.py
+++ b/model_data/app.py
@@ -122,10 +122,10 @@ def handler():
         [{"address1": p.address1, **p.walls} for p in input_properties]
     )
 
-    input_properties[6].data["address1"]
-    input_properties[6].data["postcode"]
-    walls_df["address1"].values[6]
-    walls_df["original_description"].values[6]
+    input_properties[7].data["address1"]
+    input_properties[7].data["postcode"]
+    walls_df["address1"].values[7]
+    walls_df["original_description"].values[7]
 
     from model_data.recommendations.WallRecommendations import WallRecommendations
     self = WallRecommendations(property_instance=input_properties[7], uvalue_estimates=uvalue_estimates)
diff --git a/model_data/recommendations/WallRecommendations.py b/model_data/recommendations/WallRecommendations.py
index f92421ea..95942007 100644
--- a/model_data/recommendations/WallRecommendations.py
+++ b/model_data/recommendations/WallRecommendations.py
@@ -237,9 +237,8 @@ class WallRecommendations(BaseUtility):
             band = [int(x) for x in re.findall(r'\b\d{4}\b', self.property.data["construction-age-band"])]
             return band[0]
 
-        #
-
-        raise NotImplementedError("Implement me!")
+        # We don't know when the property was built
+        return None
 
     def recommend(self):
         # if building built after 1990 + we're able to identify U-value +
@@ -262,7 +261,7 @@ class WallRecommendations(BaseUtility):
                 # Recommend insulation
                 self.find_insulation(u_value)
 
-        if is_solid_brick and insulation_thickness == "none":
+        if is_solid_brick:
 
             if insulation_thickness == "none":
                 # This is an estimated figure based on industry standards