Thanks, have posted the solution and a link to this in that post
But basically the solution is
// Fix Mandrill Issue whereas Mandrill Removes reset email link for forgootten password emails
function forgotMyPasswordEmails($nl2br, $message) {
if ( in_array( 'wp_retrieve_password', $message['tags']['automatic'] ) ) {
$nl2br = true;
}
return $nl2br;
}
add_filter( 'mandrill_nl2br', 'forgotMyPasswordEmails', 10, 2 );