You can usually find a code laying around online. If you use J or F you can use a cashback website aswell and get another 1.25% off the ticket not including taxes but that can be something if you are flying 2 people in J or F. Currently as most people have said above their is a 200£ discount from Amex for the first 10k customers. Is this is all relative to the UK market btw. My mrs recently got a 20% off first class but thats no use to us. Have a look online or sometimes you will get an email from them.