You'll receive your 'refer a friend' discount code by email. If you think you should have received a code but can't find the email, please contact us and we'll be happy to resend it.
On the basket page before checkout, you'll find a box that says 'Enter your code here'. Simply enter your code in that box (don't include any spaces) and press 'Apply' before continuing to checkout.
You can only use one code at a time. If you have any difficulty using your code, please contact us and we'll be happy to help.