diff --git a/model_data/simulation_system/generate_rdsap_change.py b/model_data/simulation_system/generate_rdsap_change.py
index 7c4c6029..a8251992 100644
--- a/model_data/simulation_system/generate_rdsap_change.py
+++ b/model_data/simulation_system/generate_rdsap_change.py
@@ -482,10 +482,6 @@ def app():
         data_by_urpn_df = process_and_prune_desriptions(data_by_urpn_df, cleaned_lookup)
 
         # Apply u-values
-        ########################
-        # Walls
-        ########################
-
         for col in ["walls_clean_description", "walls_clean_description_ENDING"]:
             data_by_urpn_df[col] = data_by_urpn_df[col].str.replace("(assumed)", "").str.rstrip()
 
@@ -493,6 +489,9 @@ def app():
             columns=["walls_clean_description", "walls_clean_description_ENDING"]
         )
 
+        def clean_missings():
+            pass
+
         if pd.isnull(data_by_urpn_df).sum().sum():
             raise ValueError("Null values found in dataset after process_and_prune_desriptions")
 
diff --git a/recommendations/rdsap_tables.py b/recommendations/rdsap_tables.py
index 6abbea8b..71c52354 100644
--- a/recommendations/rdsap_tables.py
+++ b/recommendations/rdsap_tables.py
@@ -103,31 +103,31 @@ england_wales_age_band_lookup = {
 default_wall_thickness = [
     {
         "type": "stone", "A": 500, "B": 500, "C": 500, "D": 500, "E": 450, "F": 420, "G": 420, "H": 420,
-        "I": 450, "J_K_L": 450
+        "I": 450, "J": 450, "K": 450, "L": 450
     },
     {
         "type": "solid brick", "A": 220, "B": 220, "C": 220, "D": 220, "E": 240, "F": 250, "G": 270, "H": 270,
-        "I": 300, "J_K_L": 300
+        "I": 300, "J": 300, "K": 300, "L": 300
     },
     {
         "type": "cavity", "A": 250, "B": 250, "C": 250, "D": 250, "E": 250, "F": 260, "G": 270, "H": 270,
-        "I": 300, "J_K_L": 300
+        "I": 300, "J": 300, "K": 300, "L": 300
     },
     {
         "type": "timber frame", "A": 150, "B": 150, "C": 150, "D": 250, "E": 270, "F": 270, "G": 270, "H": 270,
-        "I": 300, "J_K_L": 300
+        "I": 300, "J": 300, "K": 300, "L": 300
     },
     {
         "type": "cob", "A": 540, "B": 540, "C": 540, "D": 540, "E": 540, "F": 540, "G": 560, "H": 560, "I": 590,
-        "J_K_L": 590
+        "J": 590, "K": 590, "L": 590
     },
     {
         "type": "system build", "A": 250, "B": 250, "C": 250, "D": 250, "E": 250, "F": 300, "G": 300, "H": 300,
-        "I": 300, "J_K_L": 300
+        "I": 300, "J": 300, "K": 300, "L": 300
     },
     {
         "type": "park home", "A": None, "B": None, "C": None, "D": None, "E": None, "F": 50, "G": 50,
-        "H": None, "I": 75, "J_K_L": 100
+        "H": None, "I": 75, "J": 100, "K": 100, "L": 100
     },
 ]
 
diff --git a/recommendations/recommendation_utils.py b/recommendations/recommendation_utils.py
index 9ffab939..1b6ed8cd 100644
--- a/recommendations/recommendation_utils.py
+++ b/recommendations/recommendation_utils.py
@@ -466,8 +466,8 @@ def extract_insulation_thickness(insulation_thickness_str):
     :param insulation_thickness_str:
     :return:
     """
-    if insulation_thickness_str == "none":
-        return 0
+    if insulation_thickness_str in ["none", "average", "below average", "above average", None]:
+        return None
 
     return int(insulation_thickness_str.replace("mm", ""))