PHP Header not redirecting

My header won't redirect. After the code is executed it's
just blank and doesn't execute the redirect. There's no whitespace in the file. The code
works completely correctly apart from the
redirect.

This code is called by a
form
submit.

if(!empty($_POST['addSubscriber'])){

            $name = $_POST['name'];
 $email = $_POST['email'];
 if(!empty($name)
            && !empty($email) &&
            eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email)
            != FALSE){
 $conn = connect();
 $sql = "SELECT id FROM subscribers
            WHERE email=?";
 if($stmt = $conn->prepare($sql)){


            $stmt->bind_param("s", $email);
 $stmt->execute();

            if($stmt->fetch()){
 header("Location:
            http://bcp350.org.uk/index.php?message=1");
 } else {
 $password =
            md5(uniqid());
 $sql2 = "INSERT INTO subscribers(name, email, password)
            VALUES(?, ?, '$password')";
 if($stmt2 = $conn->prepare($sql2)){

            $stmt2->bind_param("ss", $name, $email);

            $stmt2->execute();

 if($stmt2->affected_rows == 1)

            header("Location: http://bcp350.org.uk/index.php?message=1");
 }

            }
 }
 } else {
 header("Location:
            urlnotallowedbecauseofstackoverflowlimit");

            }
}