I just used an amex code for £100 off an order of £149 or more. Amazing deal. They will let me give a similar code to 4 people, so if you are interested DM me with your email address and I’ll get them to send it.
They will give me a £10 credit for each person that uses the code.
Edit to add: Looking at what they send in the invite email, it may well be more than 4 people - the link is this one: