diff --git a/src/Utils/Validator.php b/src/Utils/Validator.php
index db7a1d0..11687a4 100644
--- a/src/Utils/Validator.php
+++ b/src/Utils/Validator.php
@@ -4,10 +4,20 @@
 
 abstract class Validator
 {
+    public static $invalidPostcodes = [
+        'KT185DN',
+        'AB154YR',
+        'B628RS',
+    ];
+
     public static function validatePostcode($postcode)
     {
         $postcode = strtoupper($postcode);
 
+        if (in_array(str_replace(' ', '', $postcode), self::$invalidPostcodes)) {
+            return false;
+        }
+
         $regex = '#^(GIR ?0AA|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]([0-9ABEHMNPRV-Y])?)|[0-9][A-HJKPS-UW]) ?[0-9][ABD-HJLNP-UW-Z]{2})$#';
 
         $result = preg_match($regex, $postcode);
diff --git a/tests/Unit/BasicUsageTest.php b/tests/Unit/BasicUsageTest.php
index 80f9e22..a7bf7fe 100644
--- a/tests/Unit/BasicUsageTest.php
+++ b/tests/Unit/BasicUsageTest.php
@@ -19,7 +19,7 @@ public function testValidation()
 
     public function testValidationFailure()
     {
-        $postcodes = ['ST163DPA', 'XF2P90', 'Ollie', 'cake', 'ST16 3DPA'];
+        $postcodes = ['ST163DPA', 'XF2P90', 'Ollie', 'cake', 'ST16 3DPA', 'KT18 5DN', 'AB15 4YR', 'B62 8RS'];
 
         foreach ($postcodes as $postcode) {
             $this->assertFalse(Validator::validatePostcode($postcode));