diff --git a/.gitignore b/.gitignore
index c4932f2d4..727da2fc4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 ## We don’t allow committing certain file types that risk containing users’ personal information
-## If you are sure that a file is OK, you can explicitly add it to the list of allowed files 
+## If you are sure that a file is OK, you can explicitly add it to the list of allowed files
 *.pdf
 *.PDF
 *.csv
@@ -26,6 +26,7 @@
 !tests/spreadsheet_files/excel_97.xls
 !tests/non_spreadsheet_files/actually_a_png.xlsx
 !tests/spreadsheet_files/excel 2007.xlsx
+!app/broadcast_areas/source_files/Lower_Tier_Local_Authority_to_Upper_Tier_Local_Authority__December_2019__Lookup_in_England_and_Wales.csv
 
 
 # Byte-compiled / optimized / DLL files
diff --git a/app/broadcast_areas/source_files/Lower_Tier_Local_Authority_to_Upper_Tier_Local_Authority__December_2019__Lookup_in_England_and_Wales.csv b/app/broadcast_areas/source_files/Lower_Tier_Local_Authority_to_Upper_Tier_Local_Authority__December_2019__Lookup_in_England_and_Wales.csv
new file mode 100644
index 000000000..4eab6ffd9
--- /dev/null
+++ b/app/broadcast_areas/source_files/Lower_Tier_Local_Authority_to_Upper_Tier_Local_Authority__December_2019__Lookup_in_England_and_Wales.csv
@@ -0,0 +1,340 @@
+FID,LTLA19CD,LTLA19NM,UTLA19CD,UTLA19NM
+1,E06000001,Hartlepool,E06000001,Hartlepool
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+335,E07000197,Stafford,E10000028,Staffordshire
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+338,E07000200,Babergh,E10000029,Suffolk
+339,E07000202,Ipswich,E10000029,Suffolk