I have just discovered the discount codes section on the forum of MoneySavingExpert.com (apologies if I am well behind the times on this) and thought I should flag it. I saved 20% on a Debenhams order I placed last night and it took me all of five seconds to find a current discount code.
You can search by retailer before you shop, so you don't have to flog through all the posts to find what you are after.
forums.moneysavingexpert.com/forumdisplay.html?f=38
Patsy