Thanks Jason,
Your quite correct in boat_insert_images_Free.php I had the wrong case.
(Still not used to php living aspland!)
The UE is applied to Thankyou2.php and within that page code states
$GoToPage = "thankyou3.php";
The page thankyou3.php does not open and the process finishes on Thankyou2.php.
No email arrives.