diff --git a/backend/address2UPRN/main.py b/backend/address2UPRN/main.py
index b2cb4d98..6006fec1 100644
--- a/backend/address2UPRN/main.py
+++ b/backend/address2UPRN/main.py
@@ -18,7 +18,7 @@ from backend.utils.addressMatch import (
     AddressMatch,
     get_uprn_candidates,
 )
-from backend.address2UPRN.scoring import df_has_single_uprn
+from backend.address2UPRN.scoring import all_uprns_match
 from datatypes.epc.domain.historic_epc_matching import (
     match_addresses_for_postcode,
 )
@@ -98,7 +98,7 @@ def get_uprn_with_epc_df(
     top_rank_df = scored_df[scored_df["lexirank"] == 1]
 
     # If rank-1 rows do not agree on a single UPRN → ambiguous
-    if not df_has_single_uprn(top_rank_df, uprn=top_rank_df.iloc[0]["uprn"]):
+    if not all_uprns_match(top_rank_df, target_uprn=top_rank_df.iloc[0]["uprn"]):
         return None
 
     address = top_rank_df["address"].values[0]
@@ -207,7 +207,7 @@ def resolve_uprns_for_postcode_group(
 
         top_rank_df = scored_df[scored_df["lexirank"] == 1]
 
-        if not df_has_single_uprn(top_rank_df, top_rank_df.iloc[0]["uprn"]):
+        if not all_uprns_match(top_rank_df, top_rank_df.iloc[0]["uprn"]):
             results.append(
                 {
                     "found_uprn": None,
diff --git a/backend/address2UPRN/scoring.py b/backend/address2UPRN/scoring.py
index d31b9aea..bfda2e71 100644
--- a/backend/address2UPRN/scoring.py
+++ b/backend/address2UPRN/scoring.py
@@ -3,12 +3,11 @@ import pandas as pd
 from backend.utils.addressMatch import AddressMatch
 
 
-def df_has_single_uprn(df: pd.DataFrame, uprn: str, column: str = "uprn") -> bool:
-    """
-    Returns True if all non-null UPRNs in df match the given uprn.
-    Returns False otherwise.
-    """
-
+def all_uprns_match(
+    df: pd.DataFrame,
+    target_uprn: str,
+    column: str = "uprn",
+) -> bool:
     if column not in df.columns:
         return False
 
@@ -17,7 +16,7 @@ def df_has_single_uprn(df: pd.DataFrame, uprn: str, column: str = "uprn") -> boo
     if len(uprns) == 0:
         return False
 
-    return len(uprns) == 1 and uprns[0] == str(uprn)
+    return len(uprns) == 1 and uprns[0] == str(target_uprn)
 
 
 def get_uprn_candidates(