<?php
App::uses('CakeEmail', 'Network/Email');

$email = new CakeEmail();

$email->attachments('/full/file/path/file.pdf')
$email->to      = 'em...@email.co.uk';
$email->subject = 'Something';
$email->replyTo = $client['Client']['email'];
$email->from    = $client['Client']['email'];
$email->emailFormat = 'html';

if($email->send()){
  die('Email Sent!');
}else{
  die('Failed to send email');
}