Instructions:Received the same e-mail as posted earlier from empire stores offering £10 off a £30 spend http://www.hotukdeals.com/item/213312/empire-stores-10-off-30-spend-disco/
But when i opened it with Outlook Express and held the cursor over the voucher code a little box popped up with another code for £15 off a £10 spend! (edit: seems to only work on a £30 spend)
Worked for me £38 of goods - £15 = £23 inc. Free Delivery
Also works with sale items, my three items were all half price or less (was £87 total)
First post hope it works!