If you shop online, you're gonna love this

Before buying anything online, you should check out www.hotukdeals.com if you haven't already.
It's a UK deals website where anyone can share and vote on deals. 

Just type in the name of the store you are shopping at and Hotukdeals will provide you with valid vouchers(and even expired ones-which you can't use) to use for your transaction for that day. Its very simple and it works. 
Don't know why anyone wouldn't want to use it.

Try it out here