Why am I being asked to enter a promotional code?
This is probably because we've sent you an email containing a promotional code, (we can never keep quiet about our best deals). During promotional discount periods, you can put in the promotional code we've sent when you sign in to My Account from the desktop version of the website.
If not, get in touch with our Web Support Team on 03457 225 333 and see if we can explain what on earth we're up to.