diff --git a/src/Utils/Tokenizer.php b/src/Utils/Tokenizer.php
index a2e18b2..d996725 100755
--- a/src/Utils/Tokenizer.php
+++ b/src/Utils/Tokenizer.php
@@ -10,18 +10,14 @@ public static function outward($postcode)
     {
         self::sanityCheck($postcode);
 
-        $postcodeStart = trim(substr($postcode, 0, -3));
-
-        return $postcodeStart;
+        return strtoupper(trim(substr($postcode, 0, -3)));
     }
 
     public static function inward($postcode)
     {
         self::sanityCheck($postcode);
 
-        $postcodeEnd = trim(substr($postcode, -3, 3));
-
-        return $postcodeEnd;
+        return strtoupper(trim(substr($postcode, -3, 3)));
     }
 
     private static function sanityCheck($postcode)
diff --git a/tests/Unit/BasicUsageTest.php b/tests/Unit/BasicUsageTest.php
index f114ff2..80f9e22 100644
--- a/tests/Unit/BasicUsageTest.php
+++ b/tests/Unit/BasicUsageTest.php
@@ -10,7 +10,7 @@ final class BasicUsageTest extends TestCase
 {
     public function testValidation()
     {
-        $postcodes = ['ST163DP', 'TN30YA', 'ST78PP', 'CM233WE', 'E16AW', 'E106QX', 'ST16 3DP'];
+        $postcodes = ['ST163DP', 'TN30YA', 'ST78PP', 'CM233WE', 'E16AW', 'E106QX', 'ST16 3DP', 'st16 3dp'];
 
         foreach ($postcodes as $postcode) {
             $this->assertTrue(Validator::validatePostcode($postcode));
@@ -82,6 +82,11 @@ public function testOutwardAndInwardCodes()
                 'outward'  => 'E1',
                 'inward'   => '6AW',
             ],
+            [
+                'postcode' => 'e1 6aw',
+                'outward'  => 'E1',
+                'inward'   => '6AW',
+            ],
         ];
 
         foreach ($postcodeTestItems as $postcodeTestItem) {