diff --git a/Modules/mip_regions.pck b/Modules/mip_regions.pck
index 75896a1..69d8c58 100644
--- a/Modules/mip_regions.pck
+++ b/Modules/mip_regions.pck
@@ -120,7 +120,7 @@ CREATE OR REPLACE PACKAGE BODY mip_regions IS
         ELSIF substr(l_postcode_format
                     ,4
                     ,1) = 'A'
-              AND instr('ABCDEFGHJKSTUW'
+              AND instr('ABEHMNPRVWXY'
                        ,substr(l_postcode
                               ,4
                               ,1)) = 0 THEN