Instructions:Received these codes that entitle you to £10, £20 and £50 off at qed-uk.com.
They do however require you to spend a certain amount before you qualify. This is good for people buying things like TV's or fridges etc.
QEDMAY50 --->When you spend over £999
QEDMAY20 --->When you spend over £499
QEDMAY10 --->When you spend over £249
Hope this helps someone.