Plus another potential 9% at Quidco! (Thanks mike916)
I just went looking for £40 jogging bottoms at American Eagle Outfitters and ended up getting three pairs delivered for £62! Their entire site is currently 40% off with the code WINTER40.. but if you sign up for their mailing list first you get another code for 15% off - and the codes stack!
I've always loved the feel of their sweatpants so for me this is an absolute no-brainer (and it means I don't have to fly to the US again anytime soon). So I hope this saves someone else a whole heap of money too.
The only exclusions are jeans and Aerie undies and the discount applies to merchandise costs only, not shipping and handling costs. Note their standard delivery is £3.95 - but with these kinds of savings, I'm really not begrudging that.