diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index 91d063656..6d15699cc 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -628,16 +628,22 @@ private
 
   def process_postcode_changes!
     self.postcode_full = upcase_and_remove_whitespace(postcode_full)
-    process_postcode(postcode_full, "postcode_known", "is_la_inferred", "la")
+    return if postcode_full.blank?
+
+    self.postcode_known = 1
+    inferred_la = get_inferred_la(postcode_full)
+    self.is_la_inferred = inferred_la.present?
+    self.la = inferred_la if inferred_la.present?
   end
 
-  def process_postcode(postcode, postcode_known_key, la_inferred_key, la_key)
-    return if postcode.blank?
+  def process_previous_postcode_changes!
+    self.ppostcode_full = upcase_and_remove_whitespace(ppostcode_full)
+    return if ppostcode_full.blank?
 
-    self[postcode_known_key] = 1
-    inferred_la = get_inferred_la(postcode)
-    self[la_inferred_key] = inferred_la.present?
-    self[la_key] = inferred_la if inferred_la.present?
+    self.ppcodenk = 0
+    inferred_la = get_inferred_la(ppostcode_full)
+    self.is_previous_la_inferred = inferred_la.present?
+    self.prevloc = inferred_la if inferred_la.present?
   end
 
   def get_has_benefits
diff --git a/app/models/log.rb b/app/models/log.rb
index 024470b21..849927cf1 100644
--- a/app/models/log.rb
+++ b/app/models/log.rb
@@ -232,11 +232,6 @@ private
 
   PIO = PostcodeService.new
 
-  def process_previous_postcode_changes!
-    self.ppostcode_full = upcase_and_remove_whitespace(ppostcode_full)
-    process_postcode(ppostcode_full, "ppcodenk", "is_previous_la_inferred", "prevloc")
-  end
-
   LA_CHANGES = {
     "E07000027" => "E06000064", # Barrow-in-Furness => Westmorland and Furness
     "E07000030" => "E06000064", # Eden => Westmorland and Furness
diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index 283485d11..f144336bf 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -278,15 +278,6 @@ class SalesLog < Log
     mortgage + deposit
   end
 
-  def process_postcode(postcode, postcode_known_key, la_inferred_key, la_key)
-    return if postcode.blank?
-
-    self[postcode_known_key] = 0
-    inferred_la = get_inferred_la(postcode)
-    self[la_inferred_key] = inferred_la.present?
-    self[la_key] = inferred_la if inferred_la.present?
-  end
-
   def outright_sale?
     ownershipsch == 3
   end
@@ -305,7 +296,22 @@ class SalesLog < Log
 
   def process_postcode_changes!
     self.postcode_full = upcase_and_remove_whitespace(postcode_full)
-    process_postcode(postcode_full, "pcodenk", "is_la_inferred", "la")
+    return if postcode_full.blank?
+
+    self.pcodenk = 0
+    inferred_la = get_inferred_la(postcode_full)
+    self.is_la_inferred = inferred_la.present?
+    self.la = inferred_la if inferred_la.present?
+  end
+
+  def process_previous_postcode_changes!
+    self.ppostcode_full = upcase_and_remove_whitespace(ppostcode_full)
+    return if ppostcode_full.blank?
+
+    self.ppcodenk = 0
+    inferred_la = get_inferred_la(ppostcode_full)
+    self.is_previous_la_inferred = inferred_la.present?
+    self.prevloc = inferred_la if inferred_la.present?
   end
 
   def reset_created_by!